RegExLib.com Regular Expression Cheat Sheet (.NET Framework)
RegExLib - Regular Expression Library

RegExLib.com Regular Expression Cheat Sheet (.NET)

Metacharacters Defined

MCharDefinition
^ Start of a string.(字符开头)
$ End of a string.(字符结尾)
. Any character (except \n newline)任意(除非\n换行)
| Alternation.或者
{...}Explicit quantifier notation.
[...]Explicit set of characters to match.
(...)Logical grouping of part of an expression.
*0 or more of previous expression.
+1 or more of previous expression.
?0 or 1 of previous expression; also forces minimal matching when an expression might match several strings within a search string.
\Preceding one of the above, it makes it a literal instead of a special character. Preceding a special matching character, see below.

Metacharacter Examples

PatternSample Matches
^abcabc, abcdefg, abc123, ...
abc$abc, endsinabc, 123abc, ...
a.cabc, aac, acc, adc, aec, ...
bill|tedted, bill
ab{2}cabbc
a[bB]cabc, aBc
(abc){2}abcabc
ab*cac, abc, abbc, abbbc, ...
ab+cabc, abbc, abbbc, ...
ab?cac, abc
a\sca c

Character Escapes http://tinyurl.com/5wm3wl

Escaped CharDescription
ordinary charactersCharacters other than . $ ^ { [ ( | ) ] } * + ? \ match themselves.
\aMatches a bell (alarm) \u0007.
\bMatches a backspace \u0008 if in a []; otherwise matches a word boundary (between \w and \W characters).
\tMatches a tab \u0009.
\rMatches a carriage return \u000D.
\vMatches a vertical tab \u000B.
\fMatches a form feed \u000C.
\nMatches a new line \u000A.
\eMatches an escape \u001B.
\040Matches an ASCII character as octal (up to three digits); numbers with no leading zero are backreferences if they have only one digit or if they correspond to a capturing group number. (For more information, see Backreferences.) For example, the character \040 represents a space.
\x20Matches an ASCII character using hexadecimal representation (exactly two digits).
\cCMatches an ASCII control character; for example \cC is control-C.
\u0020Matches a Unicode character using a hexadecimal representation (exactly four digits).
\*When followed by a character that is not recognized as an escaped character, matches that character. For example, \* is the same as \x2A.

Character Classes http://tinyurl.com/5ck4ll

Char ClassDescription
.Matches any character except \n. If modified by the Singleline option, a period character matches any character. For more information, see Regular Expression Options.
[aeiou]Matches any single character included in the specified set of characters.
[^aeiou]Matches any single character not in the specified set of characters.
[0-9a-fA-F]Use of a hyphen (–) allows specification of contiguous character ranges.
\p{name}Matches any character in the named character class specified by {name}. Supported names are Unicode groups and block ranges. For example, Ll, Nd, Z, IsGreek, IsBoxDrawing.
\P{name}Matches text not included in groups and block ranges specified in {name}.
\wMatches any word character. Equivalent to the Unicode character categories [\p{Ll}\p{Lu}\p{Lt}\p{Lo}\p{Nd}\p{Pc}]. If ECMAScript-compliant behavior is specified with the ECMAScript option, \w is equivalent to [a-zA-Z_0-9].
\WMatches any nonword character. Equivalent to the Unicode categories [^\p{Ll}\p{Lu}\p{Lt}\p{Lo}\p{Nd}\p{Pc}]. If ECMAScript-compliant behavior is specified with the ECMAScript option, \W is equivalent to [^a-zA-Z_0-9].
\sMatches any white-space character. Equivalent to the Unicode character categories [\f\n\r\t\v\x85\p{Z}]. If ECMAScript-compliant behavior is specified with the ECMAScript option, \s is equivalent to [ \f\n\r\t\v].
\SMatches any non-white-space character. Equivalent to the Unicode character categories [^\f\n\r\t\v\x85\p{Z}]. If ECMAScript-compliant behavior is specified with the ECMAScript option, \S is equivalent to [^ \f\n\r\t\v].
\dMatches any decimal digit. Equivalent to \p{Nd} for Unicode and [0-9] for non-Unicode, ECMAScript behavior.
\DMatches any nondigit. Equivalent to \P{Nd} for Unicode and [^0-9] for non-Unicode, ECMAScript behavior.