User:Deceptive/Regex

Construct	Matches
x \\ \0n \0nn \0mnn \xhh \uhhhh \t \n \r \f \a \e \cx	Characters The character x The backslash character The character with octal value 0n (0 <= n <= 7) The character with octal value 0nn (0 <= n <= 7) The character with octal value 0mnn (0 <= m <= 3, 0 <= n <= 7) The character with hexadecimal value 0xhh The character with hexadecimal value 0xhhhh The tab character ('\u0009') The newline (line feed) character ('\u000A') The carriage-return character ('\u000D') The form-feed character ('\u000C') The alert (bell) character ('\u0007') The escape character ('\u001B') The control character corresponding to x
[abc] [^abc] [a-zA-Z] [a-d[m-p]] [a-z&&[def]] [a-z&&[^bc]] [a-z&&[^m-p]]	Character Classes Any character except a, b, or c (negation) a through z or A through Z, inclusive (range) a through d, or m through p: [a-dm-p] (union) d, e, or f (intersection) a through z, except for b and c: [ad-z] (subtraction) a through z, and not m through p: [a-lq-z](subtraction)
. \d \D \s \S \w \W	Predefined Character Classes Any character (may or may not match line terminators) A digit: [0-9] A non-digit: [^0-9] A whitespace character: [ \t\n\x0B\f\r] A non-whitespace character: [^\s] A word character: [a-zA-Z_0-9] A non-word character: [^\w]
\p{Lower} \p{Upper} \p{ASCII} \p{Alpha} \p{Digit} \p{Alnum} \p{Punct} \p{Graph} \p{Print} \p{Blank} \p{Cntrl} \p{XDigit} \p{Space}	POSIX character classes (US-ASCII only) A lower-case alphabetic character: [a-z] An upper-case alphabetic character:[A-Z] All ASCII:[\x00-\x7F] An alphabetic character:[\p{Lower}\p{Upper}] A decimal digit: [0-9] An alphanumeric character:[\p{Alpha}\p{Digit}] A visible character: [\p{Alnum}\p{Punct}] A printable character: [\p{Graph}\x20] A space or a tab: [ \t] A control character: [\x00-\x1F\x7F] A hexadecimal digit: [0-9a-fA-F] A whitespace character: [ \t\n\x0B\f\r]
\p{InGreek} \p{Lu} \p{Sc} \P{InGreek} [\p{L}&&[^\p{Lu}]]	Classes for Unicode blocks and categories A character in the Greek block (simple block) An uppercase letter (simple category) A currency symbol Any character except one in the Greek block (negation) Any letter except an uppercase letter (subtraction)
^ $ \b \B \A \G \Z \z	Boundary Matchers The beginning of a line The end of a line A word boundary A non-word boundary The beginning of the input The end of the previous match The end of the input but for the final terminator, if any The end of the input
X? X* X+ X{n} X{n,} X{n,m}	Greedy Quantifiers X, once or not at all X, zero or more times X, one or more times X, exactly n times X, at least n times X, at least n but not more than m times
X?? X*? X+? X{n}? X{n,}? X{n,m}?	Reluctant Quantifiers X, once or not at all X, zero or more times X, one or more times X, exactly n times X, at least n times X, at least n but not more than m times
X++ X*+ X++ X{n}+ X{n,}+ X{n,m}+	Possessive Quantifiers X, once or not at all X, zero or more times X, one or more times X, exactly n times X, at least n times X, at least n but not more than m times
XY X|Y (X)	Logical Operators X followed by Y Either X or Y X, as a capturing group
\n	Back References Whatever the nth capturing group matched
\ \Q \E	Quotation Nothing, but quotes the following character Nothing, but quotes all characters until \E Nothing, but ends quoting started by \Q
(?:X) (?idmsux-idmsux)  (?idmsux-idmsux:X)   (?=X) (?!X) (?<=X) (?<!X) (?>X)	Special Constructs (non-capturing) Nothing, but turns match flags on - off X, as a non-capturing group with the given flags on - off X, via zero-width positive lookahead X, via zero-width negative lookahead X, via zero-width positive lookbehind X, via zero-width negative lookbehind X, as an independent, non-capturing group