常用的正则表达式一览

Matches the preceding character, subexpression, or bracketed character,
0 or more times

匹配0次或多次

Matches the preceding character, subexpression, or bracketed character,
1 or more times

匹配1次或多次

Matches any character within the brackets (i.e., “Pick any one of these
things”)

匹配中括号内的任何字符

A grouped subexpression (these are evaluated first, in the “order of
operations” of regular expressions)

子表达式

Matches the preceding character, subexpression, or bracketed character
between m and n times (inclusive)

匹配几遍

Matches any single character that is not in the brackets

取反 

Matches any character, string of characters, or subexpression, separated
by the “I” (note that this is a vertical bar, or “pipe,” not a capital “i”)

或者(匹配其中的任何一个) 

Matches any single character (including symbols, numbers, a space, etc.)

匹配任意字符(包括字母,数字,空格，其他符号) 

Indicates that a character or subexpression occurs at the beginning of a
string

以XX开头 

An escape character (this allows you to use “special” characters as their
literal meaning)

使用特殊转义符 

Often used at the end of a regular expression, it means “match this up
to the end of the string.” Without it, every regular expression has a
defacto “.*” at the end of it, accepting strings where only the first part
of the string matches. This can be thougt of as analogous to the ^
symbol.

以XX结尾 

“Does not contain.” This odd pairing of symbols, immediately preceding
a character (or regular expression), indicates that that character should
not be found in that specific place in the larger string. This can be tricky
to use; after all, the character might be found in a different part of the
string. If trying to eliminate a character entirely, use in conjunction with
a ^ and $ at either end.

不包含