Regular Expressions - Tested on at least 1 RegEng

End of Line

Search for End of Line in Unix, or Old MacOS, or Windows format

Equivalent to \R. Use \R in RegEx dialects that have \R. Dialects that I am aware have \R

	Java
	PCRE
	Perl
	PHP
	Ruby

Use the ugly circumvention below in dialects that do not have \R. Circumvention seems to work in dialects with and without \R. I have tested circumvention in

	.NET
	Go
	Java
	JavaScript
	PCRE
	Perl
	PHP
	Python
	XRegExp

And the circumvention is ...

	(\r|\r?\n)



File with Listed Extension contained in a Line

Search for line with file extension. .jpeg used in example.

	^.*\bƸExtensionƷ\b.*(?![<>\(\)"]$)

Example

	^.*\b\.jpe?g\b.*(?![<>\(\)"]$)



File with Listed Extension NOT contained in a Line

Search for line WITHOUT any of the (file extensions in a list of file extensions). Example uses CSS|HTML|Several graphics extensions|Fonts.

	^(.(?!ƸExtensionsƷ))+$

Example

	^(.(?!\.(css|html|ico|jpg|js|svg|woff\d?)\b))+$



Hex Dump

For a binary display (hex dump) where each Line consists of 3 sections: an offset onto the dump, and 2 data representation sections

	*( Whitespace )  Offset = 8(hexadecimal digits)  Whitespace
	DataAsHex = 16( Whitespace  2(hexadecimal digits) )  Whitespace
	DataAsChar = 16( Characters )

  Search for Line excluding DataAsChar section

	^\s*[\dA-Fa-f]{8}\s+(?:\s+(?:(?:[\dA-Fa-f]{2})|(?:\.{2}))){16}\s+\B



Line Does Not Contain String

Select line that does not contain string ƸNotStringƷ. Use Multiline option.

^(?!ƸNotStringƷ).)+$



Relative Path

Search for a path relative to current directory. Path must be in simplest form: first object in relative path must be an object directly under current directory. No Current Directory symbol (.). No Parent Directory symbol (..). Relative path must come immediately after a preceding text line (no intervening blank lines) and be on its own line (end with a newline)

	[^\r\n](\r|\r?\n)(\w[\w\/]+(\r|\r?\n))

Replace starting newline with 3 newlines, adding 2 blank lines

	$1$1$1$2



UUID aka GUID

Search for a Universally Unique Identifier
(UUID) aka a Globally Unique Identifier (GUID). Example eliminates lines with a semicolon anywhere before the UUID.

	\b[A-F\d]{8}-([A-F\d]{4}-){3}[A-F\d]{12}\b

^[^;]*\b[A-F\d]{8}-([A-F\d]{4}-){3}[A-F\d]{12}\b



URL
Courtesy of Internet Marketing Ninjas (https://www.internetmarketingninjas.com/tools/website-pattern-extractor/)

	(ht|f)tp(s?)\:\/\/[a-zA-Z0-9\-\._]+(\.[a-zA-Z0-9\-\._]+){2,}(\/?)([a-zA-Z0-9\-\.\?\,'\/\\+&%\$#_]*)?