en-us/Regular_Expression_Quick_Reference.help.txt
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## Basic Matching
|-:|:-| |.|any single character| |+|one or more of the preceeding pattern| |?|zero or more of the preceeding pattern| |\|escape sequence or [character class](#CharacterClasses) or backreference| |[*anyofthese*]|Any of these characters| |[^ *notoneofthese* ]|matches any character that's isnt one of these characters| |[start-end]|(matches this range)| |^|the begining of the line or string| |$|the end of the line or string| ## Character classes <a name='CharacterClasses' /> Instead of writing really long sequences of characters, you can use Regular Expressions to match certain character classes: |-:|:-| |\w|any word character (basically, any letter)| |\d|any decimal character (basically, any number (though not .))| |\s|any whitespace characters (tabs, spaces, newlines)| |\p{NAME}|any named group (these are useful, but advanced)| Each of these character classes also has an opposite. |-:|:-| |\W|any NON-word character (basically, not letters or digits but a lot of punctutation and whitespace)| |\D|any NON-decimal character (basically, any non-digit)| |\S|any NON-whitespace characters (most characters)| |\P{NAME}|NOT a named group ()| ## Groups |-:|:-| |(Pattern)|unnamed group| |(? < GroupName > Pattern)|named group| |(?:Pattern)|non-capturing group (this will match but you can't get it later)| ## Lookaround |-:|:-| |(?= Pattern)|lookahead| |(?! Pattern)|negative lookahead| |(?<= Pattern)|lookbehind| |(?<! Pattern)|negative lookbehind| |