Regular Expression

>	Regular Expressions Cheat Sheet
>		A regular expression specifies a set of strings that matches it. This cheat sheet is based off Python 3's Regular Expressions (http://docs.python.org/3/library/re.html) but is designed for searches within Sublime Text.

>	Special Characters
\				Escapes special characters or signals a special sequence.
.				Matches any single character except a newline.
^				Matches the start of the string.
$				Matches the end of the string.
*				Greedily matches 0 or more repetitions of the preceding RE.
*?				Matches 0 or more repetitions of the preceding RE.
+				Greedily matches 1 or more repetitions of the preceding RE.
+?				Matches 1 or more repetitions of the preceding RE.
?				Greedily matches 0 or 1 repetitions of the preceding RE.
??				Matches 0 or 1 repetitions of the preceding RE.
A|B				Matches A, if A is unmatched then matches B, where A and B are arbitrary REs.
{m}				Matches exactly m many repetitions of the previous RE.
{m,n}			Greedily matches from m many to n many repetitions of the previous RE.
{m,n}?			Matches m many to n many repetitions of the previous RE.

[...]			Indicates a set of characters to match.
	[amk]				Matches 'a', 'm', or 'k'.
	[a-z]				Matches 'a' through 'z'.
	[a-f0-7]			Matches 'a' through 'f' or '0' through '7'.
	[a\-z]				Matches 'a', '-', or 'z'.
	[a-]				Matches 'a' or '-'.
	[-a]				Matches 'a' or '-'.
	[(+*)]				Matches '(', '+', '*', or ')'. [] matches special characters literally.
	[\w]				Matches the character class for '\w'. See character classes.
	[^5]				Matches anything other than '5'. '^' forms the complementary set only as the first character in a set.
	[]()]				Matches ']', '(', and ')'. ']' is taken literally only as the first character in a set.
	[()\]]				Matches ']', '(', and ')'.

(...)			Matches the RE inside the parenthesis and assigns a new group.
(?P<name>...)	The RE matched is accessible by the group indicated by name.

(?...)			Extension notation which changes a RE's behavior. These do not assign a new group.
	(?aiLmsux)			Sets the corresponding flag to each letter. Does not work within Sublime Text.
	(?:...)				A non-capturing version of parenthesis. The matched substring cannot be retrieved later.
	(?P=name)			Matches the substring matched by the group named name.
	(?#...)				A comment, the contents are ignored.
	(?=...)				Lookahead assertion, the preceding RE only matches if this matches.
	(?!...)				Negative lookahead assertion, the preceding RE only matches if this doesn't match.
	(?<=...)			Positive lookbehind assertion, the following RE will only match if preceded with this fixed length RE.
	(?<!...)			Negative lookbehind assertion, the following RE will only match if not preceded with this fixed length RE.
	(?(id)true|false)	If group id exists then uses the true RE, else use the false RE.

>	Character classes
\1				Matches the contents of the group labelled by the same number. Acceptable numbers are 1-99.
\A				Matches at the start of the current string.
\b				Matches the empty string at the beginning or end of a word. \b matches the boundary between \w and \W.
\B				Matches the empty string not at the beginning or end of a word.
\d				Matches any Unicode decimal digit, including 0-9.
\D				Matches any Unicode non-decimal digit.
\s				Matches any Unicode whitespace character, including ' ', \t, \n, \r, \f and \v.
\S				Matches any Unicode non-whitespace character.
\w				Matches any Unicode word character, including a-z, A-Z, and 0-9.
\W				Matches any Unicode non-word character.
\Z				Matches at the end of the string.

\a				Matches the ASCII Bell ().
\f				Matches the ASCII Formfeed ().
\n				Matches the ASCII Linefeed.
\r				Matches the ASCII Carriage Return (
).
\t				Matches the ASCII Horizontal Tab.
\v				Matches the ASCII Vertical Tab ().