|
^
|
Start of string, or start of line in multi-line pattern
|
|
\A
|
Start of string
|
|
$
|
End of string, or end of line in multi-line pattern
|
|
\Z
|
End of string
|
|
\b
|
Word boundary
|
|
\B
|
Not word boundary
|
|
\<
|
Start of word
|
|
\>
|
End of word
|
|
\c
|
Control character
|
|
\s
|
White space
|
|
\S
|
Not white space
|
|
\d
|
Digit
|
|
\D
|
Not digit
|
|
\w
|
Word
|
|
\W
|
Not word
|
|
\x
|
Hexade-cimal digit
|
|
\O
|
Octal digit
|
|
*
|
0 or more
|
{3}
|
Exactly 3
|
|
+
|
1 or more
|
{3,}
|
3 or more
|
|
?
|
0 or 1
|
{3,5}
|
3, 4 or 5
|
|
.
|
Any character except new line (\n)
|
|
(a|b)
|
a or b
|
|
(...)
|
Group
|
|
(?:...)
|
Passive (non-c-apt-uring) group
|
|
[abc]
|
Range (a or b or c)
|
|
[^abc]
|
Not (a or b or c)
|
|
[a-q]
|
Lower case letter from a to q
|
|
[A-Q]
|
Upper case letter from A to Q
|
|
[0-7]
|
Digit from 0 to 7
|
|
\x
|
Group/-sub-pattern number "-x"
|
|
[:upper:]
|
Upper case letters
|
|
[:lower:]
|
Lower case letters
|
|
[:alpha:]
|
All letters
|
|
[:alnum:]
|
Digits and letters
|
|
[:digit:]
|
Digits
|
|
[:xdigit:]
|
Hexade-cimal digits
|
|
[:punct:]
|
Punctu-ation
|
|
[:blank:]
|
Space and tab
|
|
[:space:]
|
Blank characters
|
|
[:cntrl:]
|
Control characters
|
|
[:graph:]
|
Printed characters
|
|
[:print:]
|
Printed characters and spaces
|
|
[:word:]
|
Digits, letters and underscore
|
|
?=
|
Lookahead assertion
|
|
?!
|
Negative lookahead
|
|
?<=
|
Lookbehind assertion
|
|
?!= or ?<!
|
Negative lookbehind
|
|
?>
|
Once-only Subexp-ression
|
|
?()
|
Condition [if then]
|
|
?()|
|
Condition [if then else]
|
|
?#
|
Comment
|
|
\
|
Escape following character
|
|
\Q
|
Begin literal sequence
|
|
\E
|
End literal sequence
|
|
^
|
[
|
.
|
$
|
|
{
|
*
|
(
|
\
|
|
+
|
)
|
|
|
?
|
|
<
|
>
|
||
|
\n
|
New line
|
|
\r
|
Carriage return
|
|
\t
|
Tab
|
|
\v
|
Vertical tab
|
|
\f
|
Form feed
|
|
\xxx
|
Octal character xxx
|
|
\xhh
|
Hex character hh
|
|
g
|
Global match
|
|
i *
|
Case-i-nse-nsitive
|
|
m *
|
Multiple lines
|
|
s *
|
Treat string as single line
|
|
x *
|
Allow comments and whitespace in pattern
|
|
e *
|
Evaluate replac-ement
|
|
U *
|
Ungreedy pattern
|
|
$n
|
nth non-pa-ssive group
|
|
$2
|
"-xyz-" in /^(abc-(xy-z))$/
|
|
$1
|
"-xyz-" in /^(?:a-bc)-(xyz)$/
|
|
$`
|
Before matched string
|
|
$‘
|
After matched string
|
|
$+
|
Last matched string
|
|
$&
|
Entire matched string
|
原文：http://www.cnblogs.com/rayong/p/7399979.html