正则表达式速查表（ASP.NET）

出处：RegExLib.com Regular Expression Cheat Sheet (.NET)
元字符
说明

^
匹配字符串的开始位置

$
匹配字符串的结束位置

.
匹配任意单个字符（换行符 \n 除外）

|
交替

{…}
指定要限定的数量

[...]
指定要匹配的字符集

(…)
对表达式进行逻辑分组

*
匹配零或多个前面的表达式

+
匹配一或多个前面的表达式

?
匹配零或一个前面的表达式

\
放在上面任何一个字符之前，表示匹配该字符本身。放在其他特殊字符后面，表示字符转义（见下面）

字符转义
说明

原始字符
除 . $ ^ { [ ( | ) ] } * + ? \ 之外的字符均匹配自身

\a
匹配铃声（闹铃）\u0007

\b
在[]中匹配一个空格 \u0008，在其他情况下匹配字边界（位于 \w 和 \W 字符之间）

\t
匹配制表符 \u0009

\r
匹制回车符 \u000D

\v
匹配垂直制表符 \u000B

\f
匹配换页符 \u000C

\n
匹配换行符 \u000A

\e
匹配退出键（符） \u001B

\040
匹配以八进制表示的 ASCII 字符（最多三位数）；在没有前导零的情况下，如果只有一位数字或者相应数字与某个捕获组的编号对应，那就是反向引用（backreference）。字符 \040 表示一个空格。

\x20
匹配以十六进制表示的 ASCII 字符（两位数）

\cC
匹配 ASCII 控制符，例如 \cC 匹配 Ctrl+C

\u0020
匹配以十六进制表示的 Unicode 字符

\*
反斜杠后面如果不是一个可转义的字符，则匹配该字符本身。例如，\* 就相当于\x2A

字符类
说明

.
匹配除 \n 之外的任意字符。

[aeiou]
匹配特定字符集中包含的任意一个字符

[^aeiou]
匹配特定字符集中不包含的任意一个字符

[0-9a-fA-F]
连字符（-）用来指定连续的字符范围

\p{name}
匹配由{name}指定的命名字符类中的任意字符

\P{name}
匹配不包含在{name}指定的组或块范围中的文本

\w
匹配英文数字字母字符，在指定兼容ECMAScript的情况下，等价于[a-zA-Z0-9]

\W
匹配非英文数字字母字符，在指定兼容ECMAScript的情况下，等价于[^a-zA-Z0-9]

\s
匹配任意空白字符，在指定兼容ECMAScript的情况下，等价于[\f\n\r\t\v]

\S
匹配任意非空白字符，在指定兼容ECMAScript的情况下，等价于[^\f\n\r\t\v]

\d
匹配数字字符，在指定兼容ECMAScript的情况下，等价于[0-9]

\D
匹配非数字字符，在指定兼容ECMAScript的情况下，等价于[^0-9]
英文版:
Metacharacters Defined
MChar
Definition

^
Start of a string.

$
End of a string.

.
Any character (except \n newline)

|
Alternation.

{...}
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
Pattern
Sample Matches

^abc
abc, abcdefg, abc123, ...

abc$
abc, endsinabc, 123abc, ...

a.c
abc, aac, acc, adc, aec, ...

bill|ted
ted, bill

ab{2}c
abbc

a[bB]c
abc, aBc

(abc){2}
abcabc

ab*c
ac, abc, abbc, abbbc, ...

ab+c
abc, abbc, abbbc, ...

ab?c
ac, abc

a\sc
a c
Character Escapes http://tinyurl.com/5wm3wl Escaped Char
Description

ordinary characters
Characters other than . $ ^ { [ ( | ) ] } * + ? \ match themselves.

\a
Matches a bell (alarm) \u0007.

\b
Matches a backspace \u0008 if in a []; otherwise matches a word boundary (between \w and \W characters).

\t
Matches a tab \u0009.

\r
Matches a carriage return \u000D.

\v
Matches a vertical tab \u000B.

\f
Matches a form feed \u000C.

\n
Matches a new line \u000A.

\e
Matches an escape \u001B.

\040
Matches 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.

\x20
Matches an ASCII character using hexadecimal representation (exactly two digits).

\cC
Matches an ASCII control character; for example \cC is control-C.

\u0020
Matches 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 Class
Description

.
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}.

\w
Matches 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].

\W
Matches 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].

\s
Matches 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].

\S
Matches 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].

\d
Matches any decimal digit. Equivalent to \p{Nd} for Unicode and [0-9] for non-Unicode, ECMAScript behavior.

\D
Matches any nondigit. Equivalent to \P{Nd} for Unicode and [^0-9] for non-Unicode, ECMAScript behavior.