4chan(nel) Filtering Guide + How to Make Your Own Filters

A Gide to Filtering Posts in a Thread on 4chan(nel) + How to Create Your Own Filters

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IMPORTANT NOTES:
--- Nearly all browsers have a feature to search for text (Ctrl + F). Use this feature to jump around the guide with ease. For example, if you want to jump to the Introduction, press Ctrl + F and type in "(001.)" or "Introduction". Alternatively, if you are looking for a specific filter, you can try and search the word you want filtered and it will lead you to the appropriate filter (not guaranteed to work, however).
--- Some of these filters aren't perfect, and have ample room for improvement.
--- It is somewhat likely that you will encounter false positives and/or unintentional filtering, depending on what filters you use and where you use them.
--- The filters in this guide were made to get as little false positives as possible and avoid unintentional filtering.

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UPDATES:
Any updates to this guide will be documented here (if I ever decide to update it, that is).

(Oct. 7, 2018): Initial creation

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(000.) - TABLE OF CONTENTS

(000.) Table of Contents
(001.) Introduction
(002.) How to Apply Filters
(003.) How This Guide is Structured
(004.) Filters
	(004A.) References to Other Sites / Services
	(004B.) Links
	(004C.) Thread Personalities, E-Celebs, and Boogeymen
	(004D.) Bitching and Whining
	(004E.) Buzzwords and Cringe
	(004F.) Miscellaneous
	(004G.) "Anti-Filter" Filters
(005.) 4chan X Exclusive Filters
	(005A.) Forced Anonymity
	(005B.) Miscellaneous
	(005C.) MD5 Hashes
(006.) How to Create Your Own Filters
	(006A.) - Literal Characters and Metacharacters
	(006B.) - Character Classes and Shorthand Character Classes
	(006C.) - Grouping
	(006D.) - Quantifiers
	(006E.) - Modifiers
	(006F.) - Other Important Items
	(006G.) - Conclusion to "How to Create Your Own Filters"
(007.) Conclusion
(008.) FAQ / Troubleshooting

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(001.) - INTRODUCTION

Are you tired of seeing the same shitposts over and over again? Can't handle the banter? Someone living in your head rent-free?
Then this guide is for you!

This list contains numerous filters used to hide some common and blatant shitposting.
Below, you will find:
	--- A guide on how to add these filters to your list (for both default 4chan(nel) and 4chan X)
	--- An explanation on the structure of the filters listed
	--- Numerous filters, organized into their own categories
	--- A small guide on how to create your own filters

I highly suggest you read the beginning sections of this guide if you are new to filtering to prevent mistakes.
However, if you already have experience with filtering, then you can just go right ahead and skip straight to the list.

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(002.) - HOW TO APPLY FILTERS

IF YOU ARE USING DEFAULT 4CHAN(NEL):
Step 1: Click [Settings] in the upper or lower right-hand corner of the screen.
Step 2: A window should pop up. Click "Filters & Post Hiding".
Step 3: In this submenu, look at the setting titled "Filter and highlight specific threads/posts". Make sure that the box to the left of this setting is checked, then click [Edit] to the right of this setting.
Step 4: Another window should pop up. There should be a row of information:
	--- The check box under the "On" column toggles whether or not the filter is active.
	--- The text box under the "Pattern" column is where the actual filter goes.
	--- The small text box under the "Boards" column tells the filter what boards you want the filter to apply to, separated
	by a space. For example, if you want the filter to be applied to /v/ and /vg/, then you type in "v vg" (without quotes).
	Leave this box blank if you want the filter to apply to every board.
	--- The drop-down menu under the "Type" column is where you specify what field of the post the filter should apply to.
	The options are pretty self-explanatory. You'll likely use "Comment" a lot.
	--- The check box under the "Hide" column tells the filter that if it catches something, it will hide the offending
	post. Make sure it is checked.
	--- The x's under the "Del" column will delete the filter when clicked.
Step 5: When finished, click the "Save" button on the bottom of the pop-up window, then "Save Settings" on the next pop-up window. Make sure you click "Save" and "Save Settings" instead of the x's on the upper right-hand corner of the window, otherwise your settings and filters will not be saved!


IF YOU ARE USING 4CHAN X:
Step 1: Click the wrench icon in the upper right-hand corner of the screen.
Step 2: Click the "Filter" tab on the top of the window that pops up.
Step 3: There should be a box that says "Guide". Click it to bring up a drop-down menu.
	--- This "Guide" window contains a lot of helpful information pertaining to filters. If you've never used filters
	before or are inexperienced with them, it is suggested that you read it.
Step 4: In the drop-down menu, select the type of item that you want filtered. The options are pretty self-explanatory. You'll likely use "Comment" a lot.
Step 5: Type in or paste the filter that you want in the large text box.
	--- Make sure each filter is on a new line.
	--- If you want to disable a filter, add a # to the very front of the line. This will comment the filter out.
	To re-enable the filter, simply remove the # in front.
	--- By default, the filter will apply to all boards. If you want the filter to only apply to certain boards, then add
	"boards:[boards]" to the filter (without quotation marks, and [boards] replaced with the actual board letter(s)
	separated by commas). For example, /ass/;boards:a,b will filter any post containing "ass" on /a/ and /b/ only.
	--- The reverse is also true; if you want the filter to apply to all boards EXCEPT for a select few, then add
	"exclude:[boards]" to the filter (without quotation marks, and [boards] replaced with the actual board letter(s)
	separated by commas). For example, /fuck/;exclude:c,d will filter any post containing "fuck" everywhere EXCEPT for
	/c/ and /d/.
Step 6: When finished, close the menu and refresh the page.

###===============###===============###

(003.) - HOW THIS GUIDE IS STRUCTURED

Each entry in the guide below is structured as follows:

FILTER: The filter itself.
TYPE: What you select in the drop-down menu (See the section "How to Apply Filters" for more information)
DESCRIPTION: An explanation of the filter and what it filters.
EXAMPLES: Some (not all) examples of what gets filtered if the filter is applied.
VERSION: The version number of the filter. Used to document changes and fixes to a filter and shows if it received updates.
NOTE: Any miscellaneous notes about the filter. Not all entries will have this part.

Make sure to type in or copy the filter exactly as it appears next to "FILTER"; otherwise, it probably won't work.

###===============###===============###

(004.) - FILTERS

The following filters in this section will work for both default 4chan(nel) and 4chan X.

(004A.) - REFERENCES TO OTHER SITES / SERVICES

You have to go back, etc. etc.

FILTER: /[rpl]l?e[db]{2}it\w*\b/i
TYPE: Comment
DESCRIPTION: Filters "Reddit" and variants.
EXAMPLES: redditor, PLEBBIT, Leddit
VERSION: 1

FILTER: /(d|t)umblr/i
TYPE: Comment
DESCRIPTION: Filters "Tumblr" and variants.
EXAMPLES: tumblr, TUMBLRITE, Tumblrina
VERSION: 1

FILTER: /(dis|shits|jews?)cords?/i
TYPE: Comment
DESCRIPTION: Filters "Discord" and variants.
EXAMPLES: Discord, shitscord, JEWSCORD
VERSION: 1

FILTER: /straw[- ]?poll(?!\.me)/i
TYPE: Comment
DESCRIPTION: Filters "Strawpoll" and variants.
EXAMPLES: strawpoll, STRAW-POLL
VERSION: 1
NOTE: Will NOT filter out Strawpoll links.



(004B.) - LINKS

Don't want to see links for some reason? These are for you.

FILTER: /youtu(\.be|be\.com)/
TYPE: Comment
DESCRIPTION: Filters any YouTube links.
EXAMPLES: youtube.com/watch?v=..., youtu.be/...
VERSION: 1
NOTE: Will NOT filter out the word "YouTube".

FILTER: /strawpoll\.me/
TYPE: Comment
DESCRIPTION: Filters those Strawpolls that TOTALLY have an impact on anything and DEFINITELY do not incite pointless arguments about things that don't matter at all.
EXAMPLES: strawpoll.me/...
VERSION: 1
NOTE: Will NOT filter out the word "Strawpoll".

FILTER: /pastebin\.com/
TYPE: Comment
DESCRIPTION: Filters Pastebin links.
EXAMPLES: pastebin.com/...
VERSION: 1
NOTE: Will NOT filter out the word "Pastebin".
NOTE: Ironically, will filter out links to this Pastebin as well



(004C.) - THREAD PERSONALITIES, E-CELEBS, AND BOOGEYMEN

They live in your head rent-free.

FILTER: /\n>?t\./i
TYPE: Comment
DESCRIPTION: Filters any instance of "t.".
EXAMPLES: t. xfag, t. burger, >t. eurocuck
VERSION: 1

FILTER: /\b[\w]+(fag(got)?s?|anons?|cunts?|posters?|homos?|tards?|niggers?|shitters?|friends?|fair(y|ies))/i
TYPE: Comment
DESCRIPTION: Filters any and all Xfags, Xanons, Xcunts, Xposters, Xfriends, etc.
EXAMPLES: footfag, xyzfriend, AVATARFAGS, shitposters, newFAG, oldfags, drawfriends, ESODfag
VERSION: 1
NOTE: Very excessive. Use if you really don't want to see any mention of the above.
NOTE: Will not filter out fag, anon, cunt, poster, friend, etc.
NOTE: Causes a LOT of unintentional filtering. Things like "retard", "girlfriend", and "canon" will be caught by this filter.

FILTER: /\b[\w]+(fag(got)?s?|anons?)/i
TYPE: Comment
DESCRIPTION: Filters any and all Xfags and Xanons.
EXAMPLES: potatofag, AVATARFAGS, newFAG, oldfags, ESODfag
VERSION: 1
NOTE: Not as excessive as the filter above. Use if you want a simplified version of the filter above, or don't want most of the unintentional filtering (keyword: MOST. Still causes some unintentional filtering).
NOTE: Will not filter out fag and anon.



(004D.) - BITCHING AND WHINING

Because your opinion really matters. Be the change you want to see, or whatever.

FILTER: /blog(post(ing|s)?|shitters?|g?er)?/i
TYPE: Comment
DESCRIPTION: Filters "blogposting" and variants.
EXAMPLES: blogpost, BLOGSHITTER, Blog, blogPOSTS
VERSION: 1

FILTER: /\be[ -]?celebs?/i
TYPE: Comment
DESCRIPTION: Filters "e-celeb" and variants.
EXAMPLES: e-celeb, ECelebs, e CELEBS
VERSION: 1

FILTER: /attention[ -]?whor(e|e?ing)/i
TYPE: Comment
DESCRIPTION: Filters "attentionwhore" and variants.
EXAMPLES: attention whoring, Attentionwhore
VERSION: 1

FILTER: /off[ -]?topic/i
TYPE: Comment
DESCRIPTION: Filters "off-topic" and variants.
EXAMPLES: off-topic, Off topic
VERSION: 1

FILTER: /(content[- ]?polic(e|e?ing))|(polic(e|e?ing)[- ]?content)/i
TYPE: Comment
DESCRIPTION: Filters accusations of content policing.
EXAMPLES: content police, Policing CONTENT
VERSION: 1

FILTER: /shit[ -]?post/i
TYPE: Comment
DESCRIPTION: Filters "shitpost" itself and variants.
EXAMPLES: shitpost, SHIT POSTING, Shit-Posts
VERSION: 1



(004E.) - BUZZWORDS AND CRINGE

Remember when these words actually meant something instead of being used as generic insults?

FILTER: /primar(y|ies)/i
TYPE: Comment
DESCRIPTION: Filters "primary" and variants.
EXAMPLES: Primary, primaries
VERSION: 1

FILTER: /secondar(y|ies|y?ism)/i
TYPE: Comment
DESCRIPTION: Filters "secondary" and variants.
EXAMPLES: SECONDARIES, Secondary, secondaryism
VERSION: 1

FILTER: /te(tr|rt)iar(y|ies)/i
TYPE: Comment
DESCRIPTION: Filters "tertiary" and variants.
EXAMPLES: TETRIARIES, tertiary
VERSION: 1

FILTER: /[bz][o0]{2}mers?/i
TYPE: Comment
DESCRIPTION: Filters "boomer" and "zoomer" and variants.
EXAMPLES: boomers, ZOOMers, BOOMER
VERSION: 1

FILTER: /incels?/i
TYPE: Comment
DESCRIPTION: Filters "incel" and variants.
EXAMPLES: incel, INCELS, r/incels
VERSION: 1

FILTER: /autis(m|tic|t)s?/i
TYPE: Comment
DESCRIPTION: Filters "autism" and variants.
EXAMPLES: autism, AUTISTIC, Autists
VERSION: 1

FILTER: /cring(e|e?y|ed|ier)/i
TYPE: Comment
DESCRIPTION: Filters "cringe" and variants.
EXAMPLES: cringe, CRINGY
VERSION: 1

FILTER: /seeth(e|e?ing)/i
TYPE: Comment
DESCRIPTION: Filters "seethe" and variants.
EXAMPLES: seethe, SEETHING
VERSION: 1

FILTER: /\bdab(bed)?\b/i
TYPE: Comment
DESCRIPTION: Filters "dab" and variants.
EXAMPLES: dab, DAB, Dabbed on
VERSION: 1

FILTER: /edg(y|e)/i
TYPE: Comment
DESCRIPTION: Filters "edge" and variants.
EXAMPLES: edgelord, EDGY, ow the edge
VERSION: 1

FILTER: /\b[t2]bq?h/i
TYPE: Comment
DESCRIPTION: Filters "TBH" and variants.
EXAMPLES: tbqhdesu, Tbh
VERSION: 1

FILTER: /yikes/i
TYPE: Comment
DESCRIPTION: Filters "yikes" and variants.
EXAMPLES: Yikes, YIKES
VERSION: 1

FILTER: /(bas(te|ed|ado))(?!(\s(on|off|in|out)))/i
TYPE: Comment
DESCRIPTION: Filters misuse of "based".
EXAMPLES: based, BASTE
VERSION: 1

FILTER: /bas(te|ed|ado)/i
TYPE: Comment
DESCRIPTION: Like the above filter but has NO exceptions. Use this one OR the one above, as using both is redundant.
EXAMPLES: based on, BASTE, Absolutely BASED
VERSION: 1

FILTER: /\w+-?pills?/i
TYPE: Comment
DESCRIPTION: Filters all sorts of pills.
EXAMPLES: redpill, blue-pilled, blackpill, fuck-me-in-the-ass-pilled
VERSION: 1

FILTER: /\bwee(b|abo[ou])s?/i
TYPE: Comment
DESCRIPTION: Filters "weeaboo" and variants.
EXAMPLES: weebs, WEEABOOS
VERSION: 1

FILTER: /br+a+p/i
TYPE: Comment
DESCRIPTION: Filters "brap" and variants.
EXAMPLES: brap, BRAAAAAAP, Braphog
VERSION: 1

FILTER: /\b(kys|(kill\syour?sel(f|ves)))/i
TYPE: Comment
DESCRIPTION: Ouch
EXAMPLES: KYS, kill yourself, KILL YOURSELVES
VERSION: 1

FILTER: /\bfag(g?ot)?s?\b/i
TYPE: Comment
DESCRIPTION: Filters "faggot" by itself and variants.
EXAMPLES: fag, FAGGOT, Fags
VERSION: 1

FILTER: /\ble\b/i
TYPE: Comment
DESCRIPTION: Filters reddit incarnate
EXAMPLES: le seethe
VERSION: 1

FILTER: /trann(y|ies)?/i
TYPE: Comment
DESCRIPTION: Filters reddit incarnate
EXAMPLES: le seethe
VERSION: 1



(004F.) - MISCELLANEOUS

These filters don't really fit a particular category. However, they're still very useful.

FILTER: /\w+\*+\w+/
TYPE: Comment
DESCRIPTION: Filters words that have been censored by asterisks.
EXAMPLES: th*s, c*ck, f*ck
VERSION: 1

FILTER: /[:;x](\^)?(\s)?(\^)?(')?[)do(]/i
TYPE: Comment
DESCRIPTION: Filters a few common text faces.
EXAMPLES: :), ;O, :^). :'D
VERSION: 1
NOTE: Possibly causes unintentional filtering. Needs more testing.

FILTER: /\*[\w ]+\*/
TYPE: Comment
DESCRIPTION: Filters actions encapsulated in asterisks.
EXAMPLES: *teleports behind you*, *snap*, *brap*
VERSION: 1

FILTER: /([a-z])\1\1\1\1\1+/i
TYPE: Comment
DESCRIPTION: Filters letters repeated more than five times.
EXAMPLES: AAAAAAA, WwWwWwW, ZZZzzz
VERSION: 1

FILTER: /([a-z]-)\1+/i
TYPE: Comment
DESCRIPTION: Filters stutters. Filtering begins at 2 stutters.
EXAMPLES: C-C-C-COMBO BREAKER
VERSION: 1

FILTER: /^>[^\n]*$/
TYPE: Comment
DESCRIPTION: Filters posts with just one line of greentext.
EXAMPLES: >he doesn't know, >implying
VERSION: 1

FILTER: /\B\/(\w{1,4})\/\B/
TYPE: Comment
DESCRIPTION: Filters any mention of boards, generals, etc.
EXAMPLES: /a/, /jp/, /out/, /v/
VERSION: 1

FILTER: /~/
TYPE: Comment
DESCRIPTION: Filters the tilde.
EXAMPLES: desu~, uguu~~~

FILTER: /#/
TYPE: Comment
DESCRIPTION: Filters the pound sign / number sign / hashtag.
EXAMPLES: #handleit, #metoo



(004G.) - "ANTI-FILTER" FILTERS

Is someone trying to be slick? Then use these.

FILTER: /\b(\w\s){4}\w\b/i
TYPE: Comment
DESCRIPTION: Filters words with its letters spaced.
EXAMPLES: d i s c o r d, s e e t h i n g, b a s e d, a b c d e f g
VERSION: 1
NOTE: This filter received little testing. Possibility of unintentional filtering.

FILTER: /\b\w+[\[\{].*[\]\]]\w+\b/i
TYPE: Comment
DESCRIPTION: Filters posts broken up by square and curly brackets.
EXAMPLES: F[u]ck, tb{q}h
VERSION: 1
NOTE: This filter received little testing. Possibility of unintentional filtering.

FILTER: /\w+\.+\w+/
TYPE: Comment
DESCRIPTION: Filters posts broken up by periods.
EXAMPLES: fu.ck, hel.lo
VERSION: 1
NOTE: Will unintentionally also filter posts that don't provide a space after the period at the end of a sentence. For example,
"This is a test.You failed." will be filtered.

FILTER: /[ɑæɐɑ̃βɓʙɕçðʒɗɖəɚɵɘɛɜẽɛ̃ɝɞɠɢʛɥɦħḥɧʜɪɪ̈ɨɟʝʄɫɬɭɮʟɱŋɲɴɳɔœøɒɔ̃ɶɸɾʁɹɻʀɽɺʃʂșθʃʈʊʉʌʋʍɯɰχʎɣʏɤʒʐʑʔʕʢʡⱭⱰⱯƁƂꞴƆƇÐƉƊƊƏƎƐꞫꞬƓƔĦꞪꞍƗꞮƖꞲƘꞰⱢꞭⱮƜŊƝȠƟƤɊⱤƦƩƮŦƬꞱɄƱƲɅꞳꭓƷΘΦɁŤťṪṫŢţṬṭȚțṰṱṮṯŦŧȾⱦƬƭƮʈẗᵵƫȶ]+/
TYPE: Comment
DESCRIPTION: Filters out many letters used in other languages.
EXAMPLES: niggẽr, fɑ̃ggot
VERSION: 1
NOTE: VERY excessive. You should only use this filter if someone is actively attempting to bypass filters.

FILTER: /[àáâäæãåāăçćčèéêëēėẽęìįīíïîłńñõōøœóòöôßśšūúùüûÿžźżÀÁÂÄÆÃÅĀÇĆČÈÉÊËĒĖĘÌĮĪÍÏÎŁŃÑÕŌØŒÓÒÖÔŚŠŪÚÙÜÛŸŽŹŻ]+/
TYPE: Comment
DESCRIPTION: Filters out many letters used in other languages.
EXAMPLES: rëddit, ávatarfag
VERSION: 1
NOTE: Similar to the filter above. Might contain some duplicates.
NOTE: VERY excessive. You should only use this filter if someone is actively attempting to bypass filters.

FILTER: /[ΑαΒβΓγΔδΕεΖζΗηΘθΙιΚκΛλΜμΝνΞξΟοΠπΡρΣσςΤτΥυΦφΧχΨψΩω]+/
TYPE: Comment
DESCRIPTION: Filters out many letters used in other languages.
EXAMPLES: αsshole, Ρenis
NOTE: Similar to the two filters above. Might contain some duplicates.
NOTE: VERY excessive. You should only use this filter if someone is actively attempting to bypass filters.

FILTER: /[БГДёЖПФИйЛЦШЩЭЮЯЫЪЬАаБбВвГгДдЕеЁёЖжЗзИиЙйКкЛлМмНнОоПпРрСсТтУуФфХхЦцЧчШшЩщЪъЫыЬьЭэЮюЯя]+/
TYPE: Comment
DESCRIPTION: Filters communists.
EXAMPLES: Ьastard, Гetard
VERSION: 1
NOTE: VERY excessive. You should only use this filter if someone is actively attempting to bypass filters.

###===============###===============###

(005.) - 4CHAN X EXCLUSIVE FILTERS

The following filters in this section will only work with 4chan X, and not with default 4chan(nel).

(005A.) - FORCED ANONYMITY

Thread overrun by namefags and tripfags? Use these.

FILTER: /^(?!Anonymous$)/
TYPE: Name
DESCRIPTION: Filters any and all namefags (in other words, filters any post that has a name other than Anonymous).
EXAMPLES: Anon, AnOnYmOuS
VERSION: 1
NOTE: For some reason, this filter doesn't work in default 4chan(nel), but works flawlessly in 4chan X.
NOTE: This filter already comes with 4chan X, but it is commented out. Remove the # in front of the filter in the "Name" section to apply it.

FILTER: /^!/
TYPE: Tripcode
DESCRIPTION: Filters any and all tripfags.
EXAMPLES: !123456.abcdef
VERSION: 1
NOTE: For some reason, this filter doesn't work in default 4chan(nel), but works flawlessly in 4chan X.
NOTE: This filter already comes with 4chan X, but it is commented out. Remove the # in front of the filter in the "Tripcode" section to apply it.



(005B.) - MISCELLANEOUS

Random 4chan X-exclusive filters here.

FILTER: /^[>@]\d+$/m
TYPE: Comment
DESCRIPTION: Filters anti-(You) replying.
EXAMPLES: @123456789, >987654321
VERSION: 1



(005C.) - MD5 HASHES

4chan X allows you to filter MD5 hashes. Simply speaking, this allows you to filter images. Place the hash into the "Image MD5" section of your filter list.

Below are some other Pastebins filled with MD5 hashes.
NOTE: I did not create these Pastebins, meaning that they are subject to change/deletion.

Pepes, Wojaks, etc.
https://pastebin.com/PDL78Gy1
https://paste2.org/bMzWEOY9

Here are some specific hashes.

*none yet*

###===============###===============###

(006.) - HOW TO CREATE YOUR OWN FILTERS

The main purpose of this guide is to offer a list of pre-made filters to anyone who wants or needs them and allow the filters to be effortlessly copied into someone's filter list. Of course, it is impossible to create a list that will satisfy everyone. That's what this section is for. Don't see a certain filter that you want? Then you have the option of making one yourself.

Keep in mind that this tutorial is not meant to be a comprehensive guide; it is just a somewhat lengthy introduction to how filters operate. I recommend you do some outside research on "Regular Expressions" if you want more in-depth explanations. Also, I am no expert on the subject matter, but I know enough relevant information for filtering. With that out of the way, let's begin.

4chan(nel) and 4chan X both utilize regular expressions in JavaScript for filters. If you haven't noticed already, a lot of the filters above share a few common characteristics; for example, the forward slashes (/) at the beginning and end of the filter and the single letter at the very end (like "i"). Generally speaking, there are some rules to follow:

--- Regular expressions should be encapsulated in forward slashes (/).
--- Modifiers belong at the very end of the expression, after the final forward slash.
--- Unless specified, expressions will detect EVERY instance where it applies. For example, /mat/ filters "mat", but it also filters "doormat", "matter", "tomato", and "mate". The examples in this guide don't really convey this crucial fact, but just keep it in mind when creating filters. You'll learn how to specify when filters apply later on in this section...



(006A.) - LITERAL CHARACTERS AND METACHARACTERS

Literal characters are literally characters that do nothing. For example, in the expression /abc/, the "a", "b", and "c" are literal, ordinary characters. However, there are some characters that are special, and these are sometimes called "metacharacters". Metacharacters have a special meaning in regular expressions, and will thus likely cause errors when used alone. The metacharacters are as follows:
--- the question mark (?): See the subsection "Quantifiers".
--- the caret (^): See the subsections "Character Classes and Shorthand Character Classes" and "Other Important Items".
--- the vertical bar (|): See the subsection "Grouping and Capturing".
--- the period (.): See the subsection "Other Important Items".
--- the backslash (\): Used to turn some literal characters into metacharacters, and vice versa (See last sentence of this subsection).
--- the asterisk (*): See the subsection "Quantifiers".
--- the dollar sign ($): See the subsection "Other Important Items".
--- the plus sign (+): See the subsection "Quantifiers".
--- the opening and closing parentheses (()): See the subsection "Grouping and Capturing".
--- the opening square bracket ([): See the subsection "Character Classes and Shorthand Character Classes".
--- the opening curly bracket ({): See the subsection "Quantifiers".

Metacharacters must be preceded with a backslash (\) in order to use them as literal characters. For example, /I get $$$/ will only match "I get", while /I get \$\$\$/ will match "I get $$$". Likewise, certain literal characters preceded with a backslash become metacharacters. For example, "s" by itself is a literal character, but "\s" becomes a shorthand character class (See next section).



(006B.) - CHARACTER CLASSES AND SHORTHAND CHARACTER CLASSES

A character class will match one instance out of several. Character classes use square brackets ([]) to denote something as a character class. Hyphens (-) can be used to denote a range of characters; multiple ranges can be used at once and individual characters can be included as well. Keep in mind that character classes are case-sensitive. Below are several examples of character classes:
--- /[abc]/ will match either "a", "b", or "c" individually.
--- /[a-n]/ will match any character in the alphabet starting at "a" and ending at "n", like "e", "h", and "n".
--- /t[ioa]ts/ will match "tits", "tats", and "tots", but not "tioats", "tets", or "tAts".
--- /[a-oA-Oq-zQ-ZP]/ will match the entire alphabet EXCEPT for the lowercase "p".
--- /[0-5]/ will match any number from 0 to 5.
--- /[a-nO-Z0-7]/ will match any lowercase letter from "a" to "n", any uppercase letter from "O" to "Z", and any number from 0 to 7.

A caret (^) can be used to match characters NOT in the character class. Examples include:
--- /[^abc]/ is functionally identical to /[d-z]/ and will match any uppercase letter and any letter from "d" to "z".
--- /t[^i]ts/ will match "tats", "tots", "t8ts", "t%ts", etc., but not "tits".

Since some character classes are used so frequently, shorthand character classes are used in place of them for ease. Shorthand character classes are metacharacters that function identically to the character classes they are replacing, but are cleaner and a lot nicer to look at.
--- "\w" will match any word character, and it takes the place of [A-Za-z0-9_].
--- "\d" will match any digit, and it takes the place of [0-9].
--- "\s" will match any whitespace character, and it takes the place of spaces, tabs, and linebreaks.



(006C.) - GROUPING AND CAPTURING

You can group characters together for more intricate and precise filters. Use a set of parenthesis (()) to create a group of characters. Furthermore, you can use the vertical bar (|) to create choices for the filter you are creating. Some examples of grouping include:
--- /Fuck(er|\soff)/ will match both "Fucker" and "Fuck off".
--- /a(b|c)/ will match both "ab" and "ac".
--- /(yes|no|maybe)/ will match "yes", "no", and "maybe".



(006D.) - QUANTIFIERS

Quantifiers are used to detect repetition. They allow for more concise, organized regular expressions that are extremely useful in detecting instances of repeated and situational characters. Keep in mind that quantifiers will only detect whatever is right before them.

The plus sign (+) is used to detect instances where a word, group, or class matches one or more times. Examples include:
--- /ba+/ will match "ba", "baaa", and "baaaaaaaaaa", but not "b" or "bAAAA".
--- /pi+zza/ will match "pizza", "piiiiiza", and "piiiiiiiiiiza", but not "pzza" or "pIzza".
--- /10+/ will match 10, 10000, 1000000, and 100000000000, but not 1.
--- /(br)+/ will match "br", "brbrbr", and "brbrbrbrbrbrbr", but not "BRBR", "b", "r", or "rb".
--- /s[au]+ck/ will match "suck", "sack", "suuuuuck", "saaaaack", "suauauauck", "saaaaaauuuuuuaaaaack", etc.
--- /1\s+2/ will match "1 2", "1   2", "1        2", etc.

The asterisk (*) is used to detect instances where a word, group, or class matches zero or more times. Examples include:
--- /ab*c/ will match "abc", "ac", and "abbbbbbbc".
--- /25*/ will match 2, 25, and 255555555, but not 5.
--- /ha(ha)*/ will match "ha", "haha", "hahahahahahaha", etc.
--- /f[ua]*ck/ will match "fck", "fuck", "faaack", "fuuuuaack", etc.

The question mark (?) is used to detect instances where a word, group, or class either appears once or does not appear at all. Examples include:
--- /favou?rite/ will match both "favorite" and "favourite".
--- /ass(hole)?/ will match both "ass" and "asshole", but not "hole".
--- /no\s?space/ will match both "no space" and "nospace".
--- /red (letter|rover)?/ will match "red", "red letter", and "red rover", but not "letter" or "rover".

The curly brackets ({}) are used with numbers to detect instances where a word, group, or class repeats a certain amount of times. If the brackets have a certain number, then the expression will detect repetition according to that number. If the brackets have two numbers separated by a comma (,), then the expression will detect repetition according to that range of numbers. If the brackets have only one number followed by a comma, then the expression will detect repetition starting at that number. Examples include:
--- /ga{5}y/ will ONLY match "gaaaaay", and not "gay" or "gaaay".
--- /no{3,5}/ will match "nooo" and "nooooo", but not "no".
--- /la[zs]{2,}er/ will match "lazzzzzer", "laszer", and "lazzzzzsssszzzzszssszzer", but not "lazer" or "laser".



(006E.) - MODIFIERS

Modifiers do exactly what you'd think they do: they modify a regular expression. As stated previously, modifiers go at the very end of a regular expression after the final forward slash (/). Modifiers are NOT required for an expression to function, but they expand on the filtering capabilities of it. There are a few modifiers, but for the purposes of filtering (and the fact that 4chan(nel) uses JavaScript for regular expressions), we only care about one of them:
--- "i" is used to denote case insensitivity (in other words, capitalization doesn't matter)

The "i" modifier is extremely useful for matching patters without worrying about capitalization. For example:
--- /test/ will match "test", but /test/i will match "test", "TEST", "Test", "TeSt", "teST", etc.
--- /[bd]itch/ will match "ditch" and "bitch", but /[bd]itch/i will match "DITCH", "Bitch", "DITch", etc.

Instead of tiring yourself out by creating filters for every possible capitalization variation of a pattern, just use "i". You'll save a lot of time and effort.



(006F.) - OTHER IMPORTANT ITEMS

This subsection contains things that I couldn't find an appropriate place for, but are still extremely useful.

The period (.) represents almost anything. For example:
--- /g.y/ will match "gay", "guy", "goy", "g@y", "g%y", etc.
--- /f.gg.t/ will match "faggot", "figget", "fzggwt", "f@gg t", etc.
--- /abc.*def/ will match "abcdef", "abcyou suckdef", "abctpw_vmhlfu%def", etc.

The word boundary "\b" denotes a situation where a non-whitespace character is followed by a whitespace character, and vice versa. It is essential for narrowing down filters and making them more specific to avoid unnecessary filtering. Remember how I mentioned at the beginning of this tutorial how /mat/ will capture not only "mat", but also "doormat" and "tomato" as well? Word boundaries are the solution.
--- /mat/ will match "mat", "doormat", and "tomato", but /\bmat\b/ will ONLY match "mat".
--- /look\b/ will match "look", but not "looking" or "looks".
--- /\btry/ will match "try", "trying", and "tried", but not "retry".

The carat (^) and dollar sign ($) are called anchors, and tell the filter to look at either the beginning of a pattern or the end of a pattern. If both are used simultaneously in a single filter, they will tell the filter to only look at individual lines that ONLY contain the filtered text in question. Examples include:
--- /^p/ will match "peanut", but not "crap".
--- /b$/ will match "crab", but not "bro".
--- /^stupid/ will match "stupid anon", but not "anon is stupid".
--- /away$/ will match "go away", but not "away he goes".
--- /^potato$/ will match "potato" BY ITSELF and not "potatoes are food" and "I hate potatoes".

Lookaheads are used to give your filters exceptions and specific instances where they apply. Want to filter a certain word ONLY IF it is followed by another specific word? Then lookaheads are for you. There are two kinds of lookaheads: the positive lookahead (?=) and the negative lookahead (?!). Positive lookaheads tell the expression to match something ONLY if it is followed by something else. Likewise, negative lookaheads tell the expression to match something EXCEPT if it is followed by something else. Examples are below:
--- /ab(?=cd)/ will NOT match "ab", but it WILL match "abcd".
--- /test(?=ing|s)/ will NOT match "test" or "testies", but it WILL match "testing" and "tests".
--- /go(?!ing)/ will match every instance of "go" EXCEPT for "going".



(006G.) - CONCLUSION TO "HOW TO CREATE YOUR OWN FILTERS"

If you've made it to the end of this section, then congratulations: you now have some understanding on how filters on 4chan(nel) function. All of the information provided in this section should be more than enough for you to create your own filters. Of course, if you are still interested and this guide wasn't enough for you, you can do your own outside research. After all, this was just a simple introduction.

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(007.) - CONCLUSION

There you have it. A whole bunch of pre-made filters for you to simply copy and paste into your filter lists, plus a guide on how to create your own. Use them if you are exhausted with shitposting, or to pretend that the threads and boards you visit are of higher quality than they actually are. I know that some of these filters may be ridiculous and retarded, but I wanted to give options for readers. I recommend you check back from time to time to see if I have updated this guide and fixed something or added something else.

Happy filtering! Have fun acting like the text you filtered doesn't exist!

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(008.) - FREQUENTLY ASKED QUESTIONS / TROUBLESHOOTING

Question: Help! A filter doesn't work!
Answer: Did you...
...make sure that the filter is actually enabled / isn't commented out?
...copy and paste the filter correctly?
...specify the correct filter type?
...make sure that the filter applies to the board you want?
If you made sure that you followed the suggestions above, then the issue could be a few things:
--- The filter doesn't apply because the pattern doesn't match the text you want filtered. Check the filter again: does the filter actually apply to the text you want filtered?
--- The filter is being bypassed. See the "'Anti-Filter' Filters" section for possible solutions.
--- The filter is broken. If this is the case, I likely fucked something up. If you want, you could try and fix the filter if you know what you are doing.

Question: Can you make a filter for (insert example here)?
Answer: Sorry, but I do not do requests. I try to create filters based on the content I see. If a certain shitpost becomes repetitive and annoying, then I'll try to create a filter for it. If you encounter a shitpost that isn't covered in this guide, you can always make your own; see the section "How to Create Your Own Filters".

###===============###===============###

This part is for reference only. You can ignore it.

FILTER:
TYPE:
DESCRIPTION:
EXAMPLES:
VERSION: