en-us/Regular_Expression_Quick_Reference.help.txt
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## Basic Matching
|Pattern|Meaning| |-----:|:-------| |.|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: |Pattern|Meaning| |------:|:------| |\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. |Pattern|Meaning| |-----:|:-------| |\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|Meaning| |-----:|:-------| |(Pattern)|unnamed group| |(?\<GroupName\>Pattern)|named group| |(?:Pattern)|non-capturing group (this will match but you can't get it later)| |(?\>Pattern)|atomic group (there can be only one)| ## Lookaround |Pattern|Meaning| |-----:|:-------| |(?=Pattern)|lookahead| |(?!Pattern)|negative lookahead| |(?<=Pattern)|lookbehind| |(?<!Pattern)|negative lookbehind| |