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","published_exercise_ids":[]},"fe5716e8dd27e674c8d9a96239ea1a98":{"uuid":"fe5716e8dd27e674c8d9a96239ea1a98","type":"lesson","slug":"logical-operators-and-compound-conditions","meta":{},"title":" Logical Operators and Compound Conditions","locale":null,"tags":[],"time":75,"content":{},"youtube_id":null,"thumbnail_url":null,"description":"In this lesson, you'll deepen your understanding of conditionals with logical operators and compound conditions. ","published_exercise_ids":["50882bc9cf9e4357edc2a8eefd4a263b","f97e9b528bcfa4227c4deb5faed142f1","9838f99ff0c0472413ade1d963ca5bbc","810d31d98f696e8d6dd8eb185d47c589","9caee4abd9e7ccfb442ba615d8f6182e","39f2d78332bdcfa56ddc2f389973a42e","d225866a14a2e565fe67a7d1f0b3fa5e","e01f2887f3d3a8ebef3fa9264a49e87d"]},"348e4b2bab86ba3302fa93de733ec69b":{"uuid":"348e4b2bab86ba3302fa93de733ec69b","type":"quiz","slug":"compound-conditions","meta":{"is_free":null},"title":"Compound Conditions","locale":null,"tags":[],"time":30,"content":{},"youtube_id":null,"thumbnail_url":null,"description":"Test your knowledge of PHP logical operators and more in this quiz!","published_exercise_ids":[]},"0c0311984638b0bfddbaae21d65599b1":{"uuid":"0c0311984638b0bfddbaae21d65599b1","type":"article","slug":"common-mistakes-with-conditionals-php","meta":{},"title":"Common Mistakes with Conditionals","locale":null,"tags":[],"time":30,"content":{"body":"In this article, we're going to walk through some common mistakes programmers make when they start working with conditionals. Knowing about common mistakes doesn't necessarily stop us from making them, but it can help us catch them more quickly! \n\n## Mistake 1: Not treating expressions as distinct:\nLet's say we want to print something if our variable `$num` is equal to `1` or `2` or `3`. Why doesn't the following code work?\n```php\n$number = 5;\nif ($number === 1 || 2 || 3)\n{\n echo \"Your number is 1, 2, or 3\";\n} else {\n echo \"Your number is NOT 1, 2, or 3\";\n}\n```\nThe code above prints `\"Your number is 1, 2, or 3\"` even though our number is `5`... In a compound condition, each expression is treated separately. Since `2` and `3` are _truthy_ values, the condition above is the equivalent of `FALSE || TRUE || TRUE` which evaluates to `TRUE`. Here's one way we could rewrite the broken code:\n\n```php\n$number = 5;\nif ($number === 1 || $number === 2 || $number === 3)\n{\n echo \"Your number is 1, 2, or 3\";\n} else {\n echo \"Your number is NOT 1, 2, or 3\";\n}\n```\nThe computer will treat each expression as separate from the last, so we need to account for that in our code. \n\n## Mistake 2: Omitting Parentheses:\nWhen discussing logical operators, we mentioned their *operator precedence*\u2014the order in which the computer will evaluate expressions with multiple operators. The precedence of arithmetic operators may feel a little more comfortable, but remembering that [all operators have a precedence](https://www.php.net/manual/en/language.operators.precedence.php) in relation to one another can take getting used to...\n```php\nTRUE || FALSE \u0026\u0026 FALSE; // Evaluates to: TRUE\n\nTRUE || FALSE and FALSE; // Evaluates to: FALSE\n\n$my_bool = TRUE and FALSE; // $my_bool is TRUE\n``` \n\nThis might not crop up that often, but recall that we can avoid any risk by using parentheses to force expressions to evaluate in the order we intend:\n```php\n(TRUE || FALSE) \u0026\u0026 FALSE; // Evaluates to: FALSE\n(TRUE || FALSE) and FALSE; // Evaluates to: FALSE\n\n$my_bool = (TRUE and FALSE); // $my_bool is FALSE\n```\nLet's look at another example:\n```php\n$withdrawal = 120; \n$balance = 110;\nif (!$balance \u003C $withdrawal){\n echo \"Success\";\n $balance -= $withdrawal;\n} else {\n echo \"Insufficient Funds\";\n} \n```\nEven though the `$balance` is less than the `$withdrawal` amount, the code above makes the completes the withdrawal\u2026 why? Without parentheses, the computer first evaluate `!$balance` and then checks if that value is less than `$withdrawal`. The expression `!$balance` is converted to the falsy numeric value of `0`, therefore the expression `!$balance \u003C $withdrawal` returns `TRUE`. \n\nWhen using the `!` operator to negate a logical expression, we should wrap the expression in parentheses.\n\n```php\n$withdrawal = 120; \n$balance = 110;\nif (!($balance \u003C $withdrawal)){\n echo \"Success\";\n $balance -= $withdrawal;\n} else {\n echo \"Insufficient Funds\";\n} \n```\nAnd check out the following broken code:\n```php\nif ($age \u003C 0) || ($age \u003E 120) {\n echo \"That's an invalid age!\";\n}\n```\nThe code above will cause an error. Did you catch the mistake? We've wrapped our separate conditions in parentheses, but we also need to make sure the entire condition is inside parentheses! We should rewrite that code as: \n```php\nif ( ($age \u003C 0) || ($age \u003E 120) ) {\n echo \"That's an invalid age!\";\n}\n```\n\n## Mistake 3: Not thinking like a computer:\nOne of the most difficult things about learning to code, is learning to think the way a computer \"thinks\". It's important to look at expressions like a computer would. Consider the following code to prompt a user if they enter an invalid response:\n```php\nif ($response !== \"yes\" || $response !== \"no\"){\n echo \"You must type either yes or no\";\n}\n```\nIn the code above, we intended to catch situations where the user either didn't enter `\"yes\"` or `\"no\"`. We wrote the code the way we might say it, \"If the response isn't yes or no...\" But the expression `$response !== \"yes\" || $response !== \"no\"` will always evaluate to `TRUE` even when the `$response` was actually `\"yes\"` or `\"no\"`! If the `$response` was `\"no\"`, for example, the expression will evaluate as `TRUE || FALSE` which evaluates to `TRUE`. \n\nWe can fix this broken code by replacing the `||` operator with the `\u0026\u0026` operator:\n```php\nif ($response !== \"yes\" \u0026\u0026 $response !== \"no\"){\n echo \"You must type either yes or no\";\n}\n```\nWhen our code isn't working the way we expect, we should walk through it like a computer\u2014we should \"be\" the computer and try to read each line without our natural human bias. ","description":"In this article will go over some mistakes that are easy to make when writing more complex programs with conditionals. ","title":"Common Mistakes with Conditionals","item_reference":[],"reference_slugs":{}},"youtube_id":null,"thumbnail_url":null,"description":"In this article will go over some mistakes that are easy to make when writing more complex programs with conditionals. ","published_exercise_ids":[]},"c824e22102928e5c08ffcfc97dc2210d":{"uuid":"c824e22102928e5c08ffcfc97dc2210d","type":"project","slug":"save-the-farm","meta":{"is_free":null,"task_count":28},"title":"Save the Farm!","locale":null,"tags":[],"time":90,"content":{},"youtube_id":null,"thumbnail_url":null,"description":"_Hello there. It's been a harrowing few weeks. First your toenail issue, and now Great-Aunt Natasha's emu farm is in danger of being reposessed! So here you are---after a brief stopover at the Mayo clinic---in Uncle Boris's remote cabin in the heart of the Terror Woods. Family legend holds that a golden statue of immense value is hidden somewhere within these walls..._\n\nWelcome to the world of [interactive fiction](https://en.wikipedia.org/wiki/Interactive_fiction). In this project you'll be building a text adventure game called **Save the Farm**! ","published_exercise_ids":[]},"069a6f9cdac04b2757f05a403a194d67":{"uuid":"069a6f9cdac04b2757f05a403a194d67","type":"lesson","slug":"php-loops","meta":{},"title":"Loops","locale":null,"tags":[],"time":30,"content":{},"youtube_id":null,"thumbnail_url":null,"description":"Learn how to repeat code execution using loops in PHP.","published_exercise_ids":["2457687ae3aa649576e0a141d610aee6","103f489effd539bb366bea1789f0ef3b","2bd2de5e38711a2db8573bc8072693d4","d9d50a680525170c2769d191a5c1b43c","7d85873092a757333e16f798c60642d6","704830893cbc741af327f99f453e6608","618fcc9a3b75af3f421ac6f68a190e1e"]},"ed9564ad353bae2766988c14c0f9c2d2":{"uuid":"ed9564ad353bae2766988c14c0f9c2d2","type":"quiz","slug":"php-loops-quiz","meta":{"is_free":null},"title":"Loops","locale":null,"tags":[],"time":15,"content":{},"youtube_id":null,"thumbnail_url":null,"description":"Check your understanding of how to use loops in PHP.","published_exercise_ids":[]},"43792131f2f6cc180563e9bd0665e5b2":{"uuid":"43792131f2f6cc180563e9bd0665e5b2","type":"project","slug":"php-fizzbuzz","meta":{"is_free":null,"task_count":13},"title":"FizzBuzz","locale":null,"tags":[],"time":30,"content":{},"youtube_id":null,"thumbnail_url":"https://codecademy-content.s3.amazonaws.com/courses/php-loops/fizzbuzz.jpg","description":"Implement solutions for the FizzBuzz interview problem using different loop types in PHP.","published_exercise_ids":[]},"ef492b7a9ed65f6c029dc34a5b79106a":{"uuid":"ef492b7a9ed65f6c029dc34a5b79106a","type":"lesson","slug":"php-loops-in-html","meta":{},"title":"Loops in HTML","locale":null,"tags":[],"time":30,"content":{},"youtube_id":null,"thumbnail_url":null,"description":"PHP provides some useful shorthand for using loops in HTML. 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","published_exercise_ids":[]},"3e00c5692e034629386740a2efd55f5c":{"uuid":"3e00c5692e034629386740a2efd55f5c","type":"lesson","slug":"introduction-to-form-validation","meta":{},"title":"Introduction to Form Validation","locale":null,"tags":[],"time":45,"content":{},"youtube_id":null,"thumbnail_url":null,"description":"Learn about why validating form input is so important and various methods to accomplish it. ","published_exercise_ids":["04789d93d19a1ad419b15060b1bb8d1a","4cbdfaf87a25c60ee43360ee5ef4b574","a087641e1adce9c186d4f4e64bec2010","b1e1f5d2db4323b95678b8df905fa70c","8d172e165840ba3c7293497f74772dd1","67bd198c15d6aef60c8d0c17b6b84708","90a638588a4fb16c4b9f4918cfa984bf"]},"71f5e9332270db42c0ae91a70a4ec611":{"uuid":"71f5e9332270db42c0ae91a70a4ec611","type":"lesson","slug":"nlp-regex-conceptual","meta":{"ex_count":13},"title":"Introduction to Regular Expressions","locale":null,"tags":[],"time":120,"content":{"slug":"nlp-regex-conceptual","title":"Introduction to Regular Expressions","description":"In this lesson you will learn the syntax of regular expressions and how you can utilize them to match and search text data!","exercises":[{"node_type":"exercise","locale":"en","uuid":"9a0e4971733e1114aebaf07a1acdc8be","slug":"introduction","title":"Introduction","workspace":{"slug":"blank-workspace","type":"static","backend":"workshop"},"instructionsandhints":[],"components":[{"url":"https://s3.amazonaws.com/codecademy-content/courses/regex/regular_expressions_xkcd_2.png","_schema":"Image"},{"content":"When registering an account for a new social media app or completing an order for a gift online, nearly every piece of information you enter into a web form is validated. Did you enter a properly formatted email including an `@` symbol? Did you enter a phone number `10` digits long, with or without `-`s and parentheses? And then there's the king of them all \u2014 did your new password meet the seemingly growing number of requirements for inclusion (and exclusion) of symbols, digits, and both upper and lower case letters?\n\nWhile correcting each field in our digital lives for proper format can be a pain, it's integral to ensuring that our accounts are secure, our packages are successfully delivered, and that we can be contacted by phone and email.\n\nThe technology that fuels this verification system on nearly every website and application is the ever reliable, often quirky language of **_regular expressions_**, commonly shortened to regex, as we will use here, or regexp (\u003Ca href=\"https://english.stackexchange.com/questions/94371/what-is-the-correct-pronunciation-of-regex\" target=\"_blank\" rel=\"noopener noreferrer\"\u003Epronunciation is up for debate\u003C/a\u003E). A _regular expression_ is a special sequence of characters that describe a pattern of text that should be found, or matched, in a string or document. 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If a character is matched, you'll see it highlighted in green. If there's a checkmark next to the string, you've completely matched the whole piece of text!\n\nEnter a regular expression that matches each of the strings listed below \"Match these strings\" and does NOT match any of the strings listed below \"Don't match these strings.\"\n\nWhen you've entered a regular expression that matches the appropriate strings, a key will appear in the browser. Each key is part of a URL that contains a surprise you can uncover when you complete the lesson! Add the key to the end of the URL in the code editor and run the code to unlock the next exercise."}],"components":[{"url":"https://s3.amazonaws.com/codecademy-content/courses/regex/build/index_all.html?query=0","_schema":"WebBrowser"},{"files":[{"filename":"script.py"}],"navigator_disabled":true,"_schema":"PersistentCodeEditor"},{"content":"The simplest text we can match with regular expressions are **_literals_**. This is where our regular expression contains the exact text that we want to match. The regex `a`, for example, will match the text `a`, and the regex `bananas` will match the text `bananas`.\n\nWe can additionally match just part of a piece of text. Perhaps we are searching a document to see if the word `monkey` occurs, since we love monkeys. We could use the regex `monkey` to match `monkey` in the piece of text `The monkeys like to eat bananas.`.\n\nNot only are we able to match alphabetical characters \u2014 digits work as well! The regex `3` will match the `3` in the piece of text `34`, and the regex `5 gibbons` will completely match the text `5 gibbons`!\n\nRegular expressions operate by moving character by character, from left to right, through a piece of text. 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Add the key to the end of the URL in the code editor and run the code to unlock the next exercise.',\n hint: ''\n}, function (Tests, callback)\n {\n Tests.pythonTest('test1.py', callback);\n });","files":[{"filename":"test1.py","content":"load_file_in_context('script.py')\n\nif url != 'https://s3.amazonaws.com/codecademy-content/courses/regex/on':\n fail_tests(\"Sorry, this is not the correct key to move on to the next exercise. Try to complete the activity in the browser to receive the next piece of the url!\")\n\npass_tests()"}]},"filepath":"new/content/courses/en/nlp-regex/units/nlp-regex-intro/lessons/nlp-regex-conceptual/exercises/literals.en.yml"},{"node_type":"exercise","locale":"en","uuid":"60500b0fae7892761542f989ae0c8162","slug":"alternation","title":"Alternation","workspace":{"slug":"nlp-regex-conceptual-alternation-v0","type":"python3","backend":"workshop"},"instructionsandhints":[{"instructions":"The interactive applet in the browser allows you to enter a regular expression and see if it matches a string of text. If a character is matched, you'll see it highlighted in green. If there's a checkmark next to the string, you've completely matched the whole piece of text!\n\nEnter a regular expression that matches each of the strings listed below \"Match these strings\" and does NOT match any of the strings listed below \"Don't match these strings.\"\n\nWhen you've entered a regular expression that matches the appropriate strings, a key will appear in the browser. Add the key to the end of the URL in the code editor and run the code to unlock the next exercise!"}],"components":[{"url":"https://s3.amazonaws.com/codecademy-content/courses/regex/build/index_all.html?query=1","_schema":"WebBrowser"},{"files":[{"filename":"script.py"}],"navigator_disabled":true,"_schema":"PersistentCodeEditor"},{"content":"Do you love baboons and gorillas? You can find either of them with the same regular expression using **_alternation!_** Alternation, performed in regular expressions with the pipe symbol, `|`, allows us to match either the characters preceding the `|` OR the characters after the `|`. The regex `baboons|gorillas` will match `baboons` in the text `I love baboons`, but will also match `gorillas` in the text `I love gorillas`.\n\nAre you thinking about how to match the whole piece of text `I love baboons` or `I love gorillas`? We will get to that later on!","_schema":"Narrative"}],"tests":{"checkpoints":"checkpoint({\n instructions: 'The interactive applet in the browser allows you to enter a regular expression and see if it matches a string of text. If a character is matched, you\\'ll see it highlighted in green. If there\\'s a checkmark next to the string, you\\'ve completely matched the whole piece of text!\\n\\nEnter a regular expression that matches each of the strings listed below \"Match these strings\" and does NOT match any of the strings listed below \"Don\\'t match these strings.\"\\n\\nWhen you\\'ve entered a regular expression that matches the appropriate strings, a key will appear in the browser. Add the key to the end of the URL in the code editor and run the code to unlock the next exercise!',\n hint: ''\n}, function (Tests, callback)\n {\n Tests.pythonTest('test1.py', callback);\n });","files":[{"filename":"test1.py","content":"load_file_in_context('script.py')\n\nif url != 'https://s3.amazonaws.com/codecademy-content/courses/regex/onyour':\n fail_tests(\"Sorry, this is not the correct key to move on to the next exercise. Try to complete the activity in the browser to receive the next piece of the url!\")\n\npass_tests()"}]},"filepath":"new/content/courses/en/nlp-regex/units/nlp-regex-intro/lessons/nlp-regex-conceptual/exercises/alternation.en.yml"},{"node_type":"exercise","locale":"en","uuid":"954fcac0ffd9bb70f7d44f00a78055bf","slug":"character-sets","title":"Character Sets","workspace":{"slug":"nlp-regex-conceptual-character-sets-v0","type":"python3","backend":"workshop"},"instructionsandhints":[{"instructions":"The interactive applet in the browser allows you to enter a regular expression and see if it matches a string of text. If a character is matched, you'll see it highlighted in green. If there's a checkmark next to the string, you've completely matched the whole piece of text!\n\nEnter a regular expression that matches each of the strings listed below \"Match these strings\" and does NOT match any of the strings listed below \"Don't match these strings.\"\n\nWhen you've entered a regular expression that matches the appropriate strings, a key will appear in the browser. Add the key to the end of the URL in the code editor and run the code to unlock the next exercise!"}],"components":[{"url":"https://s3.amazonaws.com/codecademy-content/courses/regex/build/index_all.html?query=2","_schema":"WebBrowser"},{"files":[{"filename":"script.py"}],"navigator_disabled":true,"_schema":"PersistentCodeEditor"},{"content":"Spelling tests may seem like a distant memory from grade school, but we ultimately take them every day while typing. It's easy to make mistakes on commonly misspelled words like `consensus`, and on top of that, there are sometimes alternate spellings for the same word. \n\n**_Character sets_**, denoted by a pair of brackets `[]`, let us match one character from a series of characters, allowing for matches with incorrect or different spellings.\n\nThe regex `con[sc]en[sc]us` will match `consensus`, the correct spelling of the word, but also match the following three incorrect spellings: `concensus`, `consencus`, and `concencus`. The letters inside the first brackets, `s` and `c`, are the different possibilities for the character that comes after `con` and before `en`. Similarly for the second brackets, `s` and `c` are the different character possibilities to come after `en` and before `us`.\n\nThus the regex `[cat]` will match the characters `c`, `a`, _or_ `t`, but not the text `cat`. \n\nThe beauty of character sets (and alternation) is that they allow our regular expressions to become more flexible and less rigid than by just matching with literals!\n\nWe can make our character sets even more powerful with the help of the carrot `^` symbol. Placed at the front of a character set, the `^` negates the set, matching any character that is _not_ stated. These are called _negated character sets_. Thus the regex `[^cat]` will match any character that is not `c`, `a`, _or_ `t`, and would completely match each character `d`, `o` _or_ `g`.\n\nDo we have a consensus that regular expressions are pretty cool?","_schema":"Narrative"}],"tests":{"checkpoints":"checkpoint({\n instructions: 'The interactive applet in the browser allows you to enter a regular expression and see if it matches a string of text. If a character is matched, you\\'ll see it highlighted in green. If there\\'s a checkmark next to the string, you\\'ve completely matched the whole piece of text!\\n\\nEnter a regular expression that matches each of the strings listed below \"Match these strings\" and does NOT match any of the strings listed below \"Don\\'t match these strings.\"\\n\\nWhen you\\'ve entered a regular expression that matches the appropriate strings, a key will appear in the browser. Add the key to the end of the URL in the code editor and run the code to unlock the next exercise!',\n hint: ''\n}, function (Tests, callback)\n {\n Tests.pythonTest('test1.py', callback);\n });","files":[{"filename":"test1.py","content":"load_file_in_context('script.py')\n\nif url != 'https://s3.amazonaws.com/codecademy-content/courses/regex/onyourexciting':\n fail_tests(\"Sorry, this is not the correct key to move on to the next exercise. Try to complete the activity in the browser to receive the next piece of the url!\")\n\npass_tests()"}]},"filepath":"new/content/courses/en/nlp-regex/units/nlp-regex-intro/lessons/nlp-regex-conceptual/exercises/character-sets.en.yml"},{"node_type":"exercise","locale":"en","uuid":"e221a8deeec70eb6f377896dabcda4b9","slug":"wildcards","title":"Wild for Wildcards","workspace":{"slug":"nlp-regex-conceptual-wildcards-v0","type":"python3","backend":"workshop"},"instructionsandhints":[{"instructions":"The interactive applet in the browser allows you to enter a regular expression and see if it matches a string of text. If a character is matched, you'll see it highlighted in green. If there's a checkmark next to the string, you've completely matched the whole piece of text!\n\nEnter a regular expression that matches each of the strings listed below \"Match these strings\" and does NOT match any of the strings listed below \"Don't match these strings.\"\n\nWhen you've entered a regular expression that matches the appropriate strings, a key will appear in the browser. Add the key to the end of the URL in the code editor and run the code to unlock the next exercise!"}],"components":[{"url":"https://s3.amazonaws.com/codecademy-content/courses/regex/build/index_all.html?query=3","_schema":"WebBrowser"},{"files":[{"filename":"script.py"}],"navigator_disabled":true,"_schema":"PersistentCodeEditor"},{"content":"Sometimes we don't care exactly WHAT characters are in a text, just that there are SOME characters. Enter the wildcard `.`! **_Wildcards_** will match any single character (letter, number, symbol or whitespace) in a piece of text. They are useful when we do not care about the specific value of a character, but only that a character exists!\n\nLet's say we want to match any 9-character piece of text. The regex `.........` will completely match `orangutan` and `marsupial`! Similarly, the regex `I ate . bananas` will completely match both `I ate 3 bananas` and `I ate 8 bananas`!\n\nWhat happens if we want to match an actual period, `.`? We can use the escape character, `\\`, to escape the wildcard functionality of the `.` and match an actual period. The regex `Howler monkeys are really lazy\\.` will completely match the text `Howler monkeys are really lazy.`.","_schema":"Narrative"}],"tests":{"checkpoints":"checkpoint({\n instructions: 'The interactive applet in the browser allows you to enter a regular expression and see if it matches a string of text. If a character is matched, you\\'ll see it highlighted in green. If there\\'s a checkmark next to the string, you\\'ve completely matched the whole piece of text!\\n\\nEnter a regular expression that matches each of the strings listed below \"Match these strings\" and does NOT match any of the strings listed below \"Don\\'t match these strings.\"\\n\\nWhen you\\'ve entered a regular expression that matches the appropriate strings, a key will appear in the browser. Add the key to the end of the URL in the code editor and run the code to unlock the next exercise!',\n hint: ''\n}, function (Tests, callback)\n {\n Tests.pythonTest('test1.py', callback);\n });","files":[{"filename":"test1.py","content":"load_file_in_context('script.py')\n\nif url != 'https://s3.amazonaws.com/codecademy-content/courses/regex/onyourexcitingjourney':\n fail_tests(\"Sorry, this is not the correct key to move on to the next exercise. Try to complete the activity in the browser to receive the next piece of the url!\")\n\npass_tests()"}]},"filepath":"new/content/courses/en/nlp-regex/units/nlp-regex-intro/lessons/nlp-regex-conceptual/exercises/wildcards.en.yml"},{"node_type":"exercise","locale":"en","uuid":"4d5fdf72e2477edb0b353882df66beff","slug":"ranges","title":"Ranges","workspace":{"slug":"nlp-regex-conceptual-ranges-v0","type":"python3","backend":"workshop"},"instructionsandhints":[{"instructions":"The interactive applet in the browser allows you to enter a regular expression and see if it matches a string of text. If a character is matched, you'll see it highlighted in green. If there's a checkmark next to the string, you've gotten a match!\n\nEnter a regular expression that matches each of the three strings listed below \"Match these strings\" and does NOT match any of the three strings listed below \"Don't match these strings.\"\n\nWhen you've entered a regular expression that matches the appropriate strings, a key will appear in the browser. Copy the key into the code editor and run the code to unlock the next exercise!"}],"components":[{"url":"https://s3.amazonaws.com/codecademy-content/courses/regex/build/index_all.html?query=4","_schema":"WebBrowser"},{"files":[{"filename":"script.py"}],"navigator_disabled":true,"_schema":"PersistentCodeEditor"},{"content":"Character sets are great, but their true power isn't realized without ranges. **_Ranges_** allow us to specify a range of characters in which we can make a match without having to type out each individual character. The regex `[abc]`, which would match any character `a`, `b`, _or_ `c`, is equivalent to regex range `[a-c]`. The `-` character allows us to specify that we are interested in matching a range of characters.\n\nThe regex `I adopted [2-9] [b-h]ats` will match the text `I adopted 4 bats` as well as `I adopted 8 cats` and even `I adopted 5 hats`.\n\nWith ranges we can match any single capital letter with the regex `[A-Z]`, lowercase letter with the regex `[a-z]`, any digit with the regex `[0-9]`. We can even have multiple ranges in the same character set! To match any single capital _or_ lowercase alphabetical character, we can use the regex `[A-Za-z]`. \n\nRemember, within any character set `[]` we only match _one_ character.","_schema":"Narrative"}],"tests":{"checkpoints":"checkpoint({\n instructions: 'The interactive applet in the browser allows you to enter a regular expression and see if it matches a string of text. If a character is matched, you\\'ll see it highlighted in green. If there\\'s a checkmark next to the string, you\\'ve gotten a match!\\n\\nEnter a regular expression that matches each of the three strings listed below \"Match these strings\" and does NOT match any of the three strings listed below \"Don\\'t match these strings.\"\\n\\nWhen you\\'ve entered a regular expression that matches the appropriate strings, a key will appear in the browser. Copy the key into the code editor and run the code to unlock the next exercise!',\n hint: ''\n}, function (Tests, callback)\n {\n Tests.pythonTest('test1.py', callback);\n });","files":[{"filename":"test1.py","content":"load_file_in_context('script.py')\n\nif url != 'https://s3.amazonaws.com/codecademy-content/courses/regex/onyourexcitingjourneylearning':\n fail_tests(\"Sorry, this is not the correct key to move on to the next exercise. Try to complete the activity in the browser to receive the next piece of the url!\")\n\npass_tests()"}]},"filepath":"new/content/courses/en/nlp-regex/units/nlp-regex-intro/lessons/nlp-regex-conceptual/exercises/ranges.en.yml"},{"node_type":"exercise","locale":"en","uuid":"8d275d6ffac05c5debdd95948ed9cf0a","slug":"shorthand-character-classes","title":"Shorthand Character Classes","workspace":{"slug":"nlp-regex-conceptual-shorthand-character-classes-v0","type":"python3","backend":"workshop"},"instructionsandhints":[{"instructions":"The interactive applet in the browser allows you to enter a regular expression and see if it matches a string of text. If a character is matched, you'll see it highlighted in green. If there's a checkmark next to the string, you've completely matched the whole piece of text!\n\nEnter a regular expression that matches each of the strings listed below \"Match these strings\" and does NOT match any of the strings listed below \"Don't match these strings.\"\n\nWhen you've entered a regular expression that matches the appropriate strings, a key will appear in the browser. Add the key to the end of the URL in the code editor and run the code to unlock the next exercise!"}],"components":[{"url":"https://s3.amazonaws.com/codecademy-content/courses/regex/build/index_all.html?query=5","_schema":"WebBrowser"},{"files":[{"filename":"script.py"}],"navigator_disabled":true,"_schema":"PersistentCodeEditor"},{"content":"While character ranges are extremely useful, they can be cumbersome to write out every single time you want to match common ranges such as those that designate alphabetical characters or digits. To alleviate this pain, there are **_shorthand character classes_** that represent common ranges, and they make writing regular expressions much simpler. These shorthand classes include:\n* `\\w`: the \"word character\" class represents the regex range `[A-Za-z0-9_]`, and it matches a single uppercase character, lowercase character, number or underscore\n* `\\d`: the \"digit character\" class represents the regex range `[0-9]`, and it matches a single digit character\n* `\\s`: the \"whitespace character\" class represents the regex range `[ \\t\\r\\n\\f]`, matching a single space, tab, carriage return, line break or form feed\n\nFor example, the regex `\\d\\s\\w\\w\\w\\w\\w\\w\\w` matches a digit character, followed by a whitespace character, followed by 7 word characters. Thus the regex completely matches the text `3 monkeys`.\n\nIn addition to the shorthand character classes `\\w`, `\\d`, and `\\s`, we also have access to the _negated shorthand character classes_! These shorthands will match any character that is NOT in the regular shorthand classes. These negated shorthand classes include:\n* `\\W`: the \"non word character\" class represents the regex range `[^A-Za-z0-9_]`, matching any character that is not included in the range represented by `\\w`\n* `\\D`: the \"non digit character\" class represents the regex range `[^0-9]`, matching any character that is not included in the range represented by `\\d`\n* `\\S`: the \"non whitespace character\" class represents the regex range `[^ \\t\\r\\n\\f]`, matching any character that is not included in the range represented by `\\s`","_schema":"Narrative"}],"tests":{"checkpoints":"checkpoint({\n instructions: 'The interactive applet in the browser allows you to enter a regular expression and see if it matches a string of text. If a character is matched, you\\'ll see it highlighted in green. If there\\'s a checkmark next to the string, you\\'ve completely matched the whole piece of text!\\n\\nEnter a regular expression that matches each of the strings listed below \"Match these strings\" and does NOT match any of the strings listed below \"Don\\'t match these strings.\"\\n\\nWhen you\\'ve entered a regular expression that matches the appropriate strings, a key will appear in the browser. Add the key to the end of the URL in the code editor and run the code to unlock the next exercise!',\n hint: ''\n}, function (Tests, callback)\n {\n Tests.pythonTest('test1.py', callback);\n });","files":[{"filename":"test1.py","content":"load_file_in_context('script.py')\n\nif url != 'https://s3.amazonaws.com/codecademy-content/courses/regex/onyourexcitingjourneylearningto':\n fail_tests(\"Sorry, this is not the correct key to move on to the next exercise. Try to complete the activity in the browser to receive the next piece of the url!\")\n\npass_tests()"}]},"filepath":"new/content/courses/en/nlp-regex/units/nlp-regex-intro/lessons/nlp-regex-conceptual/exercises/shorthand-character-classes.en.yml"},{"node_type":"exercise","locale":"en","uuid":"b0dff74c19f9d19a07ba16ea5284c39c","slug":"grouping","title":"Grouping","workspace":{"slug":"nlp-regex-conceptual-grouping-v0","type":"python3","backend":"workshop"},"instructionsandhints":[{"instructions":"The interactive applet in the browser allows you to enter a regular expression and see if it matches a string of text. If a character is matched, you'll see it highlighted in green. If there's a checkmark next to the string, you've completely matched the whole piece of text!\n\nEnter a regular expression that matches each of the strings listed below \"Match these strings\" and does NOT match any of the strings listed below \"Don't match these strings.\"\n\nWhen you've entered a regular expression that matches the appropriate strings, a key will appear in the browser. Add the key to the end of the URL in the code editor and run the code to unlock the next exercise!"}],"components":[{"url":"https://s3.amazonaws.com/codecademy-content/courses/regex/build/index_all.html?query=6","_schema":"WebBrowser"},{"files":[{"filename":"script.py"}],"navigator_disabled":true,"_schema":"PersistentCodeEditor"},{"content":"Remember when we were in love with baboons and gorillas a few exercises ago? We were able to match either `baboons` or `gorillas` using the regex `baboons|gorillas`, taking advantage of the `|` symbol.\n\nBut what if we want to match the whole piece of text `I love baboons` and `I love gorillas` with the same regex? Your first guess might be to use the regex `I love baboons|gorillas`. This regex, while it would completely match the string `I love baboons`, would not match `I love gorillas`, and would instead match `gorillas`. This is because the `|` symbol matches the _entire_ expression before or after itself.\n\nGrouping to the rescue! **_Grouping_**, denoted with the open parenthesis `(` and the closing parenthesis `)`, lets us group parts of a regular expression together, and allows us to limit alternation to part of the regex.\n\nThe regex `I love (baboons|gorillas)` will match the text `I love ` and _then_ match either `baboons` or `gorillas`, as the grouping limits the reach of the `|` to the text within the parentheses.\n\nThese groups are also called _capture groups_, as they have the power to select, or capture, a substring from our matched text.","_schema":"Narrative"}],"tests":{"checkpoints":"checkpoint({\n instructions: 'The interactive applet in the browser allows you to enter a regular expression and see if it matches a string of text. If a character is matched, you\\'ll see it highlighted in green. If there\\'s a checkmark next to the string, you\\'ve completely matched the whole piece of text!\\n\\nEnter a regular expression that matches each of the strings listed below \"Match these strings\" and does NOT match any of the strings listed below \"Don\\'t match these strings.\"\\n\\nWhen you\\'ve entered a regular expression that matches the appropriate strings, a key will appear in the browser. Add the key to the end of the URL in the code editor and run the code to unlock the next exercise!',\n hint: ''\n}, function (Tests, callback)\n {\n Tests.pythonTest('test1.py', callback);\n });","files":[{"filename":"test1.py","content":"load_file_in_context('script.py')\n\nif url != 'https://s3.amazonaws.com/codecademy-content/courses/regex/onyourexcitingjourneylearningtocode':\n fail_tests(\"Sorry, this is not the correct key to move on to the next exercise. Try to complete the activity in the browser to receive the next piece of the url!\")\n\npass_tests()"}]},"filepath":"new/content/courses/en/nlp-regex/units/nlp-regex-intro/lessons/nlp-regex-conceptual/exercises/grouping.en.yml"},{"node_type":"exercise","locale":"en","uuid":"f9fe554eba89cb12bb0aa0e9a5092661","slug":"quantifiers-fixed","title":"Quantifiers - Fixed","workspace":{"slug":"nlp-regex-conceptual-quantifiers-fixed-v0","type":"python3","backend":"workshop"},"instructionsandhints":[{"instructions":"The interactive applet in the browser allows you to enter a regular expression and see if it matches a string of text. If a character is matched, you'll see it highlighted in green. If there's a checkmark next to the string, you've completely matched the whole piece of text!\n\nEnter a regular expression that matches each of the strings listed below \"Match these strings\" and does NOT match any of the strings listed below \"Don't match these strings.\"\n\nWhen you've entered a regular expression that matches the appropriate strings, a key will appear in the browser. Add the key to the end of the URL in the code editor and run the code to unlock the next exercise!"}],"components":[{"url":"https://s3.amazonaws.com/codecademy-content/courses/regex/build/index_all.html?query=7","_schema":"WebBrowser"},{"files":[{"filename":"script.py"}],"navigator_disabled":true,"_schema":"PersistentCodeEditor"},{"content":"Here's where things start to get really interesting. So far we have only matched text on a character by character basis. But instead of writing the regex `\\w\\w\\w\\w\\w\\w\\s\\w\\w\\w\\w\\w\\w`, which would match 6 word characters, followed by a whitespace character, and then followed by more 6 word characters, such as in the text `rhesus monkey`, is there a better way to denote the quantity of characters we want to match?\n\nThe answer is yes, with the help of quantifiers! **_Fixed quantifiers_**, denoted with curly braces `{}`, let us indicate the exact quantity of a character we wish to match, or allow us to provide a quantity range to match on.\n* `\\w{3}` will match _exactly_ 3 word characters\n* `\\w{4,7}` will match _at minimum_ 4 word characters and _at maximum_ 7 word characters\n\nThe regex `roa{3}r` will match the characters `ro` followed by `3` `a`s, and then the character `r`, such as in the text `roaaar`. The regex `roa{3,7}r` will match the characters `ro` followed by _at least_ `3` `a`s and _at most_ `7` `a`s, followed by an `r`, matching the strings `roaaar`, `roaaaaar` and `roaaaaaaar`.\n\nAn important note is that quantifiers are considered to be _greedy_. This means that they will match the greatest quantity of characters they possibly can. For example, the regex `mo{2,4}` with match the text `moooo` in the string `moooo`, and not return a match of `moo`, or `mooo`. This is because the fixed quantifier wants to match the largest number of `o`s as possible, which is `4` in the string `moooo`.","_schema":"Narrative"}],"tests":{"checkpoints":"checkpoint({\n instructions: 'The interactive applet in the browser allows you to enter a regular expression and see if it matches a string of text. If a character is matched, you\\'ll see it highlighted in green. If there\\'s a checkmark next to the string, you\\'ve completely matched the whole piece of text!\\n\\nEnter a regular expression that matches each of the strings listed below \"Match these strings\" and does NOT match any of the strings listed below \"Don\\'t match these strings.\"\\n\\nWhen you\\'ve entered a regular expression that matches the appropriate strings, a key will appear in the browser. Add the key to the end of the URL in the code editor and run the code to unlock the next exercise!',\n hint: ''\n}, function (Tests, callback)\n {\n Tests.pythonTest('test1.py', callback);\n });","files":[{"filename":"test1.py","content":"load_file_in_context('script.py')\n\nif url != 'https://s3.amazonaws.com/codecademy-content/courses/regex/onyourexcitingjourneylearningtocodeyou':\n fail_tests(\"Sorry, this is not the correct key to move on to the next exercise. Try to complete the activity in the browser to receive the next piece of the url!\")\n\npass_tests()"}]},"filepath":"new/content/courses/en/nlp-regex/units/nlp-regex-intro/lessons/nlp-regex-conceptual/exercises/quantifiers-fixed.en.yml"},{"node_type":"exercise","locale":"en","uuid":"292b20ddff382fd901ae61e45e1d23ce","slug":"quantifiers-optional","title":"Quantifiers - Optional","workspace":{"slug":"nlp-regex-conceptual-quantifiers-optional-v0","type":"python3","backend":"workshop"},"instructionsandhints":[{"instructions":"The interactive applet in the browser allows you to enter a regular expression and see if it matches a string of text. If a character is matched, you'll see it highlighted in green. If there's a checkmark next to the string, you've completely matched the whole piece of text!\n\nEnter a regular expression that matches each of the strings listed below \"Match these strings\" and does NOT match any of the strings listed below \"Don't match these strings.\"\n\nWhen you've entered a regular expression that matches the appropriate strings, a key will appear in the browser. Add the key to the end of the URL in the code editor and run the code to unlock the next exercise!"}],"components":[{"url":"https://s3.amazonaws.com/codecademy-content/courses/regex/build/index_all.html?query=8","_schema":"WebBrowser"},{"files":[{"filename":"script.py"}],"navigator_disabled":true,"_schema":"PersistentCodeEditor"},{"content":"You are working on a research project that summarizes the findings of primate behavioral scientists from around the world. Of particular interest to you are the scientists' observations of humor in chimpanzees, so you whip up some regex to find all occurrences of the word `humor` in the documents you have collected. To your dismay, your regex misses the observations of amusement written by scientists hailing from British English speaking countries, where the spelling of the word is `humour`. Optional quantifiers to the rescue!\n\n**_Optional quantifiers_**, indicated by the question mark `?`, allow us to indicate a character in a regex is optional, or can appear either `0` times or `1` time. For example, the regex `humou?r` matches the characters `humo`, then either `0` occurrences or `1` occurrence of the letter `u`, and finally the letter `r`. Note the `?` _only_ applies to the character directly before it.\n\nWith all quantifiers, we can take advantage of grouping to make even more advanced regexes. The regex `The monkey ate a (rotten)? banana` will completely match both `The monkey ate a rotten banana` and `The monkey ate a banana`.\n\nSince the `?` is a metacharacter, you need to use the escape character in your regex in order to match a question mark `?` in a piece of text. The regex `Aren't owl monkeys beautiful\\?` will thus completely match the text `Aren't owl monkeys beautiful?`.","_schema":"Narrative"}],"tests":{"checkpoints":"checkpoint({\n instructions: 'The interactive applet in the browser allows you to enter a regular expression and see if it matches a string of text. If a character is matched, you\\'ll see it highlighted in green. If there\\'s a checkmark next to the string, you\\'ve completely matched the whole piece of text!\\n\\nEnter a regular expression that matches each of the strings listed below \"Match these strings\" and does NOT match any of the strings listed below \"Don\\'t match these strings.\"\\n\\nWhen you\\'ve entered a regular expression that matches the appropriate strings, a key will appear in the browser. Add the key to the end of the URL in the code editor and run the code to unlock the next exercise!',\n hint: ''\n}, function (Tests, callback)\n {\n Tests.pythonTest('test1.py', callback);\n });","files":[{"filename":"test1.py","content":"load_file_in_context('script.py')\n\nif url != 'https://s3.amazonaws.com/codecademy-content/courses/regex/onyourexcitingjourneylearningtocodeyouwill':\n fail_tests(\"Sorry, this is not the correct key to move on to the next exercise. Try to complete the activity in the browser to receive the next piece of the url!\")\n\npass_tests()"}]},"filepath":"new/content/courses/en/nlp-regex/units/nlp-regex-intro/lessons/nlp-regex-conceptual/exercises/quantifiers-optional.en.yml"},{"node_type":"exercise","locale":"en","uuid":"0288af2cf6a6fa9fdc8a3446ce866693","slug":"quantifiers-kleene","title":"Quantifiers - 0 or More, 1 or More","workspace":{"slug":"nlp-regex-conceptual-quantifiers-kleene-v0","type":"python3","backend":"workshop"},"instructionsandhints":[{"instructions":"The interactive applet in the browser allows you to enter a regular expression and see if it matches a string of text. If a character is matched, you'll see it highlighted in green. If there's a checkmark next to the string, you've completely matched the whole piece of text!\n\nEnter a regular expression that matches each of the strings listed below \"Match these strings\" and does NOT match any of the strings listed below \"Don't match these strings.\"\n\nWhen you've entered a regular expression that matches the appropriate strings, a key will appear in the browser. Add the key to the end of the URL in the code editor and run the code to unlock the next exercise!"}],"components":[{"url":"https://s3.amazonaws.com/codecademy-content/courses/regex/build/index_all.html?query=9","_schema":"WebBrowser"},{"files":[{"filename":"script.py"}],"navigator_disabled":true,"_schema":"PersistentCodeEditor"},{"content":"In 1951, mathematician Stephen Cole Kleene developed a system to match patterns in written language with mathematical notation. This notation is now known as regular expressions!\n\nIn his honor, the next piece of regular expressions syntax we will learn is known as the Kleene star. The **_Kleene star_**, denoted with the asterisk `*`, is also a quantifier, and matches the preceding character `0` or more times. This means that the character doesn't need to appear, can appear once, or can appear many many times.\n\nThe regex `meo*w` will match the characters `me`, followed by `0` or more `o`s, followed by a `w`. Thus the regex will match `mew`, `meow`, `meooow`, and `meoooooooooooow`.\n\nAnother useful quantifier is the **_Kleene plus_**, denoted by the plus `+`, which matches the preceding character `1` or more times. \n\nThe regex `meo+w` will match the characters `me`, followed by `1` or more `o`s, followed by a `w`. Thus the regex will match `meow`, `meooow`, and `meoooooooooooow`, but not match `mew`.\n\nLike all the other metacharacters, in order to match the symbols `*` and `+`, you need to use the escape character in your regex. The regex `My cat is a \\*` will completely match the text `My cat is a *`.","_schema":"Narrative"}],"tests":{"checkpoints":"checkpoint({\n instructions: 'The interactive applet in the browser allows you to enter a regular expression and see if it matches a string of text. If a character is matched, you\\'ll see it highlighted in green. If there\\'s a checkmark next to the string, you\\'ve completely matched the whole piece of text!\\n\\nEnter a regular expression that matches each of the strings listed below \"Match these strings\" and does NOT match any of the strings listed below \"Don\\'t match these strings.\"\\n\\nWhen you\\'ve entered a regular expression that matches the appropriate strings, a key will appear in the browser. Add the key to the end of the URL in the code editor and run the code to unlock the next exercise!',\n hint: ''\n}, function (Tests, callback)\n {\n Tests.pythonTest('test1.py', callback);\n });","files":[{"filename":"test1.py","content":"load_file_in_context('script.py')\n\nif url != 'https://s3.amazonaws.com/codecademy-content/courses/regex/onyourexcitingjourneylearningtocodeyouwillfind':\n fail_tests(\"Sorry, this is not the correct key to move on to the next exercise. Try to complete the activity in the browser to receive the next piece of the url!\")\n\npass_tests()"}]},"filepath":"new/content/courses/en/nlp-regex/units/nlp-regex-intro/lessons/nlp-regex-conceptual/exercises/quantifiers-kleene.en.yml"},{"node_type":"exercise","locale":"en","uuid":"d01d19204d4e20771993a95f270e2d4b","slug":"anchors","title":"Anchors","workspace":{"slug":"nlp-regex-conceptual-anchors-v0","type":"python3","backend":"workshop"},"instructionsandhints":[{"instructions":"The interactive applet in the browser allows you to enter a regular expression and see if it matches a string of text. If a character is matched, you'll see it highlighted in green. If there's a checkmark next to the string, you've completely matched the whole piece of text!\n\nEnter a regular expression that matches each of the strings listed below \"Match these strings\" and does NOT match any of the strings listed below \"Don't match these strings.\"\n\nWhen you've entered a regular expression that matches the appropriate strings, a key will appear in the browser. Add the key to the end of the URL in the code editor and run the code to unlock the next exercise!\n\nWith this last key, you have the complete URL! Before proceeding to the next exercise, open the link in a new tab and see your surprise :)"}],"components":[{"url":"https://s3.amazonaws.com/codecademy-content/courses/regex/build/index_all.html?query=10","_schema":"WebBrowser"},{"files":[{"filename":"script.py"}],"navigator_disabled":true,"_schema":"PersistentCodeEditor"},{"content":"When writing regular expressions, it's useful to make the expression as specific as possible in order to ensure that we do not match unintended text. To aid in this mission of specificity, we can use the anchor metacharacters. The **_anchors_** hat `^` and dollar sign `$` are used to match text at the start and end of a string, respectively.\n\nThe regex `^Monkeys: my mortal enemy$` will completely match the text `Monkeys: my mortal enemy` but not match `Spider Monkeys: my mortal enemy in the wild` or `Squirrel Monkeys: my mortal enemy in the wild`. The `^` ensures that the matched text begins with `Monkeys`, and the `$` ensures the matched text ends with `enemy`.\n\nWithout the anchor tags, the regex `Monkeys: my mortal enemy` will match the text `Monkeys: my mortal enemy` in both `Spider Monkeys: my mortal enemy in the wild` and `Squirrel Monkeys: my mortal enemy in the wild`.\n\nOnce again, as with all other metacharacters, in order to match the symbols `^` and `$`, you need to use the escape character in your regex. The regex `My spider monkey has \\$10\\^6 in the bank` will completely match the text `My spider monkey has $10^6 in the bank`.\n","_schema":"Narrative"}],"tests":{"checkpoints":"checkpoint({\n instructions: 'The interactive applet in the browser allows you to enter a regular expression and see if it matches a string of text. If a character is matched, you\\'ll see it highlighted in green. If there\\'s a checkmark next to the string, you\\'ve completely matched the whole piece of text!\\n\\nEnter a regular expression that matches each of the strings listed below \"Match these strings\" and does NOT match any of the strings listed below \"Don\\'t match these strings.\"\\n\\nWhen you\\'ve entered a regular expression that matches the appropriate strings, a key will appear in the browser. Add the key to the end of the URL in the code editor and run the code to unlock the next exercise!\\n\\nWith this last key, you have the complete URL! Before proceeding to the next exercise, open the link in a new tab and see your surprise :)',\n hint: ''\n}, function (Tests, callback)\n {\n Tests.pythonTest('test1.py', callback);\n });","files":[{"filename":"test1.py","content":"load_file_in_context('script.py')\n\nif url != 'https://s3.amazonaws.com/codecademy-content/courses/regex/onyourexcitingjourneylearningtocodeyouwillfindthis.gif':\n fail_tests(\"Sorry, this is not the correct key to move on to the next exercise. Try to complete the activity in the browser to receive the next piece of the url!\")\n\npass_tests()"}]},"filepath":"new/content/courses/en/nlp-regex/units/nlp-regex-intro/lessons/nlp-regex-conceptual/exercises/anchors.en.yml"},{"node_type":"exercise","locale":"en","uuid":"21203e331a46c36bc0d53573aa824c38","slug":"review","title":"Review","workspace":{"slug":"nlp-regex-conceptual-review-v0","type":"python3","backend":"workshop"},"instructionsandhints":[],"components":[{"url":"https://s3.amazonaws.com/codecademy-content/courses/regex/build/index_all.html?query=11","_schema":"WebBrowser"},{"files":[{"filename":"script.py"}],"navigator_disabled":true,"_schema":"PersistentCodeEditor"},{"content":"Do you feel those regular expression superpowers coursing through your body? Do you just want to scream `ah+` really loud? Awesome! You are now ready to take these skills and use them out in the wild. Before beginning your adventures, let's review what we've learned.\n* _Regular expressions_ are special sequences of characters that describe a pattern of text that is to be matched\n* We can use _literals_ to match the exact characters that we desire\n* _Alternation_, using the pipe symbol `|`, allows us to match the text preceding and following the `|`\n* _Character sets_, denoted by a pair of brackets `[]`, let us match one character from a series of characters\n* _Wildcards_, represented by the period or dot `.`, will match any single character (letter, number, symbol or whitespace)\n* _Ranges_ allow us to specify a range of characters in which we can make a match\n* _Shorthand character classes_ like `\\w`, `\\d` and `\\s` represent the ranges representing word characters, digit characters, and whitespace characters, respectively\n* _Groupings_, denoted with parentheses `()`, group parts of a regular expression together, and allows us to limit alternation to part of a regex\n* _Fixed quantifiers_, represented with curly braces `{}`, let us indicate the exact quantity or a range of quantity of a character we wish to match\n* _Optional quantifiers_, indicated by the question mark `?`, allow us to indicate a character in a regex is optional, or can appear either `0` times or `1` time\n* The _Kleene star_, denoted with the asterisk `*`, is a quantifier that matches the preceding character `0` or more times\n* The _Kleene plus_, denoted by the plus `+`, matches the preceding character `1` or more times\n* The _anchor_ symbols hat `^` and dollar sign `$` are used to match text at the start and end of a string, respectively","instructions":"The interactive applet in the browser allows you to enter a regular expression and see if it matches a string of text. If a character is matched, you'll see it highlighted in green. If there's a checkmark next to the string, you've completely matched the whole piece of text!\n\nEnter a regular expression that matches each of the telephone numbers listed below \"Match these strings\". This is a tricky one, so have some fun. Good luck!","_schema":"Narrative"}],"tests":{},"filepath":"new/content/courses/en/nlp-regex/units/nlp-regex-intro/lessons/nlp-regex-conceptual/exercises/review.en.yml"}]},"youtube_id":null,"thumbnail_url":null,"description":"In this lesson you will learn the syntax of regular expressions and how you can utilize them to match and search text data!","published_exercise_ids":["9a0e4971733e1114aebaf07a1acdc8be","270da082e3f4f88c97f50577bac226c3","60500b0fae7892761542f989ae0c8162","954fcac0ffd9bb70f7d44f00a78055bf","e221a8deeec70eb6f377896dabcda4b9","4d5fdf72e2477edb0b353882df66beff","8d275d6ffac05c5debdd95948ed9cf0a","b0dff74c19f9d19a07ba16ea5284c39c","f9fe554eba89cb12bb0aa0e9a5092661","292b20ddff382fd901ae61e45e1d23ce","0288af2cf6a6fa9fdc8a3446ce866693","d01d19204d4e20771993a95f270e2d4b","21203e331a46c36bc0d53573aa824c38"]},"a9b97b3c2c3346921f09b30266338db3":{"uuid":"a9b97b3c2c3346921f09b30266338db3","type":"lesson","slug":"introduction-to-php-form-validation","meta":{},"title":"Introduction to PHP Form Validation","locale":null,"tags":[],"time":90,"content":{},"youtube_id":null,"thumbnail_url":null,"description":"Learn the basic theory and practice of validating and sanitizing user input. 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6.705zm2.245-9.871h-2.245v6.446h2.245c2.187 0 3.77-1.036 3.77-3.28 0-2.245-1.583-3.166-3.77-3.166zm21.518 16.691-4.46-7.741h-2.821v7.741h-4v-20.145h7.568c4.404 0 6.994 2.62 6.994 6.13 0 1.9-.777 4.317-3.828 5.526l5.151 8.49h-4.604zm-.72-13.986c0-1.784-1.295-2.705-3.51-2.705h-3.051v5.468h3.05c2.216 0 3.511-1.036 3.511-2.763zm16.453-6.504c5.843 0 10.533 4.346 10.533 10.418s-4.69 10.417-10.533 10.417c-5.842 0-10.533-4.345-10.533-10.417s4.691-10.418 10.533-10.418zm0 17.152c3.799 0 6.36-2.878 6.36-6.734 0-3.857-2.561-6.734-6.36-6.734s-6.36 2.877-6.36 6.734c0 3.856 2.561 6.734 6.36 6.734z" fill="#fff"></path></g></svg><div class="fld__TAyiKqSVLPDYEpwvcd68M flg-0__30XiDjD2eMW-sqUPROY1jm fls-1__2MULxgCsHBgUDk-aYSx7JV title__x95mVsb3MaTbet73DiRPf">Mad Lib Functions</div><div class="fld__TAyiKqSVLPDYEpwvcd68M flg-1__3I5UX1Z1GNlEHAmLfB1nuD fls-0__o_9O8bkMHghg85IYak58u shortDescription__3HWv-l9SjQqtl9_doL3BH_">Freeform Project</div></div></a></div></div></div></div></div></div></div><div class="flex__1DXxWA75qIiehzlE9Hl8tx col__32wIqoLfm46b6qhAEZ5JTW complete__2SFh8_026WSGDrR0sTL39k unit__3RntiOH92_C2Qz3AFIp9QP"><button type="button" aria-label="Hide content" event="click" class="asButton__2u5u6yOsjyO99GaSdsS57u"><div class="flex__1DXxWA75qIiehzlE9Hl8tx row__cqkxg6Ld1Ugd4dReD_LK7 align-center___4czj8D6zfd0m04k4leyM justify-center__3pT-DZ7IHuUR16BSDfuQCW undefined unitHeader__1yXffLbR_sV4mwToocJ8Xy"><div class="flex__1DXxWA75qIiehzlE9Hl8tx fld__TAyiKqSVLPDYEpwvcd68M fls-0__o_9O8bkMHghg85IYak58u align-center___4czj8D6zfd0m04k4leyM justify-center__3pT-DZ7IHuUR16BSDfuQCW unitIndex__OWfiBC_oDCvQw6uLMqmuw">4</div><div class="flex__1DXxWA75qIiehzlE9Hl8tx fld__TAyiKqSVLPDYEpwvcd68M flg-1__3I5UX1Z1GNlEHAmLfB1nuD fls-1__2MULxgCsHBgUDk-aYSx7JV col__32wIqoLfm46b6qhAEZ5JTW justify-center__3pT-DZ7IHuUR16BSDfuQCW unitName__1bz3SLz8wptF6ohnryfiuL"><div class="noWrap__2HJBWz6VT42GH46vZrVrJ7">PHP Built-in Functions</div></div><div class="flex__1DXxWA75qIiehzlE9Hl8tx 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4.317-3.828 5.526l5.151 8.49h-4.604zm-.72-13.986c0-1.784-1.295-2.705-3.51-2.705h-3.051v5.468h3.05c2.216 0 3.511-1.036 3.511-2.763zm16.453-6.504c5.843 0 10.533 4.346 10.533 10.418s-4.69 10.417-10.533 10.417c-5.842 0-10.533-4.345-10.533-10.417s4.691-10.418 10.533-10.418zm0 17.152c3.799 0 6.36-2.878 6.36-6.734 0-3.857-2.561-6.734-6.36-6.734s-6.36 2.877-6.36 6.734c0 3.856 2.561 6.734 6.36 6.734z" fill="#fff"></path></g></svg><div class="fld__TAyiKqSVLPDYEpwvcd68M flg-0__30XiDjD2eMW-sqUPROY1jm fls-1__2MULxgCsHBgUDk-aYSx7JV title__x95mVsb3MaTbet73DiRPf">Intro to Built-in PHP Functions</div><div class="fld__TAyiKqSVLPDYEpwvcd68M flg-1__3I5UX1Z1GNlEHAmLfB1nuD fls-0__o_9O8bkMHghg85IYak58u shortDescription__3HWv-l9SjQqtl9_doL3BH_">Multiple Choice Quiz</div></div></a></div><div data-testid="content-item-project"><a class="noUnderline__1SC6_eVwcicCvkuSVbHlDb link__2aU7OvXJmLyj20kEMPY18r" href="/pro/membership" event="click"><div class="flex__1DXxWA75qIiehzlE9Hl8tx row__cqkxg6Ld1Ugd4dReD_LK7 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shortDescription__3HWv-l9SjQqtl9_doL3BH_">Multiple Choice Quiz</div></div></a></div><div data-testid="content-item-lesson"><a class="noUnderline__1SC6_eVwcicCvkuSVbHlDb link__2aU7OvXJmLyj20kEMPY18r" href="/courses/learn-php/lessons/associative-arrays/resume" event="click"><div class="flex__1DXxWA75qIiehzlE9Hl8tx row__cqkxg6Ld1Ugd4dReD_LK7 align-center___4czj8D6zfd0m04k4leyM justify-center__3pT-DZ7IHuUR16BSDfuQCW contentListItem__3XlHMY6-cpoNhB9a64yI3o" title="Associative Arrays"><div class="flex__1DXxWA75qIiehzlE9Hl8tx fld__TAyiKqSVLPDYEpwvcd68M flg-0__30XiDjD2eMW-sqUPROY1jm fls-0__o_9O8bkMHghg85IYak58u align-center___4czj8D6zfd0m04k4leyM justify-center__3pT-DZ7IHuUR16BSDfuQCW nextContainer__3Gt_cIMxZOJot0nwwtXtUA"></div><div class="flex__1DXxWA75qIiehzlE9Hl8tx fld__TAyiKqSVLPDYEpwvcd68M flg-0__30XiDjD2eMW-sqUPROY1jm fls-0__o_9O8bkMHghg85IYak58u align-center___4czj8D6zfd0m04k4leyM justify-center__3pT-DZ7IHuUR16BSDfuQCW container__2fm_JH_BgwPPv53QI1LeT_"><div 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6.994 2.62 6.994 6.13 0 1.9-.777 4.317-3.828 5.526l5.151 8.49h-4.604zm-.72-13.986c0-1.784-1.295-2.705-3.51-2.705h-3.051v5.468h3.05c2.216 0 3.511-1.036 3.511-2.763zm16.453-6.504c5.843 0 10.533 4.346 10.533 10.418s-4.69 10.417-10.533 10.417c-5.842 0-10.533-4.345-10.533-10.417s4.691-10.418 10.533-10.418zm0 17.152c3.799 0 6.36-2.878 6.36-6.734 0-3.857-2.561-6.734-6.36-6.734s-6.36 2.877-6.36 6.734c0 3.856 2.561 6.734 6.36 6.734z" fill="#fff"></path></g></svg><div class="fld__TAyiKqSVLPDYEpwvcd68M flg-0__30XiDjD2eMW-sqUPROY1jm fls-1__2MULxgCsHBgUDk-aYSx7JV title__x95mVsb3MaTbet73DiRPf">Bob's Budget</div><div class="fld__TAyiKqSVLPDYEpwvcd68M flg-1__3I5UX1Z1GNlEHAmLfB1nuD fls-0__o_9O8bkMHghg85IYak58u shortDescription__3HWv-l9SjQqtl9_doL3BH_">Freeform Project</div></div></a></div></div></div></div></div></div></div><div class="flex__1DXxWA75qIiehzlE9Hl8tx col__32wIqoLfm46b6qhAEZ5JTW complete__2SFh8_026WSGDrR0sTL39k unit__3RntiOH92_C2Qz3AFIp9QP"><button type="button" aria-label="Hide content" 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6.994 2.62 6.994 6.13 0 1.9-.777 4.317-3.828 5.526l5.151 8.49h-4.604zm-.72-13.986c0-1.784-1.295-2.705-3.51-2.705h-3.051v5.468h3.05c2.216 0 3.511-1.036 3.511-2.763zm16.453-6.504c5.843 0 10.533 4.346 10.533 10.418s-4.69 10.417-10.533 10.417c-5.842 0-10.533-4.345-10.533-10.417s4.691-10.418 10.533-10.418zm0 17.152c3.799 0 6.36-2.878 6.36-6.734 0-3.857-2.561-6.734-6.36-6.734s-6.36 2.877-6.36 6.734c0 3.856 2.561 6.734 6.36 6.734z" fill="#fff"></path></g></svg><div class="fld__TAyiKqSVLPDYEpwvcd68M flg-0__30XiDjD2eMW-sqUPROY1jm fls-1__2MULxgCsHBgUDk-aYSx7JV title__x95mVsb3MaTbet73DiRPf">Save the Farm!</div><div class="fld__TAyiKqSVLPDYEpwvcd68M flg-1__3I5UX1Z1GNlEHAmLfB1nuD fls-0__o_9O8bkMHghg85IYak58u shortDescription__3HWv-l9SjQqtl9_doL3BH_">Freeform Project</div></div></a></div></div></div></div></div></div></div><div class="flex__1DXxWA75qIiehzlE9Hl8tx col__32wIqoLfm46b6qhAEZ5JTW complete__2SFh8_026WSGDrR0sTL39k unit__3RntiOH92_C2Qz3AFIp9QP"><button type="button" aria-label="Hide content" 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href="/courses/learn-php/lessons/nlp-regex-conceptual/resume" event="click"><div class="flex__1DXxWA75qIiehzlE9Hl8tx row__cqkxg6Ld1Ugd4dReD_LK7 align-center___4czj8D6zfd0m04k4leyM justify-center__3pT-DZ7IHuUR16BSDfuQCW contentListItem__3XlHMY6-cpoNhB9a64yI3o" title="Introduction to Regular Expressions"><div class="flex__1DXxWA75qIiehzlE9Hl8tx fld__TAyiKqSVLPDYEpwvcd68M flg-0__30XiDjD2eMW-sqUPROY1jm fls-0__o_9O8bkMHghg85IYak58u align-center___4czj8D6zfd0m04k4leyM justify-center__3pT-DZ7IHuUR16BSDfuQCW nextContainer__3Gt_cIMxZOJot0nwwtXtUA"></div><div class="flex__1DXxWA75qIiehzlE9Hl8tx fld__TAyiKqSVLPDYEpwvcd68M flg-0__30XiDjD2eMW-sqUPROY1jm fls-0__o_9O8bkMHghg85IYak58u align-center___4czj8D6zfd0m04k4leyM justify-center__3pT-DZ7IHuUR16BSDfuQCW container__2fm_JH_BgwPPv53QI1LeT_"><div class="both__3SYyjWPkbsFxo-pO2ALEDs connector__1jtIxzXAys-m2BJuyOdf-Q"></div><div class="flex__1DXxWA75qIiehzlE9Hl8tx align-center___4czj8D6zfd0m04k4leyM justify-center__3pT-DZ7IHuUR16BSDfuQCW 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container__2fm_JH_BgwPPv53QI1LeT_"><div class="both__3SYyjWPkbsFxo-pO2ALEDs connector__1jtIxzXAys-m2BJuyOdf-Q"></div><div class="flex__1DXxWA75qIiehzlE9Hl8tx align-center___4czj8D6zfd0m04k4leyM justify-center__3pT-DZ7IHuUR16BSDfuQCW icon__1wdclztRIZxK0s8ZfPk-H5"><em name="editor" class="i__3Sy29_7-FMzo-1b7QcjE0i ikona-editor__2cssvks6s-iVb2Qj2TrcO-"></em></div></div><div class="fld__TAyiKqSVLPDYEpwvcd68M flg-0__30XiDjD2eMW-sqUPROY1jm fls-1__2MULxgCsHBgUDk-aYSx7JV title__x95mVsb3MaTbet73DiRPf">Introduction to PHP Form Validation</div><div class="fld__TAyiKqSVLPDYEpwvcd68M flg-1__3I5UX1Z1GNlEHAmLfB1nuD fls-0__o_9O8bkMHghg85IYak58u shortDescription__3HWv-l9SjQqtl9_doL3BH_">Interactive Lesson</div><div class="fld__TAyiKqSVLPDYEpwvcd68M flg-0__30XiDjD2eMW-sqUPROY1jm fls-0__o_9O8bkMHghg85IYak58u progressContainer__1LtOdVFCufewgg6nhfFF42"><div class="progress__14E_LRew9UU8eZ7F0Vdhq7">8<!-- -->%</div></div></div></a></div><div data-testid="content-item-quiz"><a 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