از ویکیپدیا، دانشنامهٔ آزاد
Regular expressions[ویرایش]
| Anchors
|
| ^
|
Start of string
|
| \A
|
Start of string
|
| $
|
End of string
|
| \Z
|
End of string
|
| \b
|
Word boundary
|
| \B
|
Not word boundary
|
| \<
|
Start of word
|
| \>
|
End of word
|
| Character classes
|
| \c
|
Control character
|
| \s
|
White space
|
| \S
|
Not white space
|
| \d
|
Digit
|
| \D
|
Not digit
|
| \w
|
Word
|
| \W
|
Not word
|
| \x
|
Hexademical digit
|
| \O
|
Octal digit
|
| POSIX
|
| [:upper:]
|
Upper case letters
|
| [:lower:]
|
Lower case letters
|
| [:alpha:]
|
All letters
|
| [:alnum:]
|
Digits and letters
|
| [:digit:]
|
Digits
|
| [:xdigit:]
|
Hexadecimal digits
|
| [:punct:]
|
Punctuation
|
| [:blank:]
|
Space and tab
|
| [:space:]
|
Blank characters
|
| [:cntrl:]
|
Control characters
|
| [:graph:]
|
Printed characters
|
| [:print:]
|
Printed characters and spaces
|
| [:word:]
|
Digits, letters and underscore
|
| Assertions
|
| ?=
|
Lookahead assertion
|
| ?!
|
Negative lookahead
|
| ?<=
|
Lookbehind assertion
|
| ?!= or ?<!
|
Negative lookbehind
|
| ?>
|
Once-only subexpression
|
| ?()
|
Condition [if then]
|
| ?()|
|
Condition [if then else]
|
| ?#
|
Comment
|
Derivate work of a cheat sheet created by Dave Child. Released under a Creative Commons license.
|
| Quantifiers
|
| *
|
0 or more
|
| +
|
1 or more
|
| ?
|
0 or 1
|
| {3}
|
Exactly 3
|
| {3,}
|
3 or more
|
| {3,5}
|
3, 4, or 5
|
| Quantifier modifers
|
| "x" below represents a quantifier
|
| x?
|
Ungreedy version of "x"
|
| Escape character
|
| \
|
Escape character
|
| Metacharacters (must be escaped)
|
| ^
|
[
|
.
|
| $
|
{
|
*
|
| (
|
\
|
+
|
| )
|
|
|
?
|
| <
|
>
|
|
| Special characters
|
| \n
|
New line
|
| \r
|
Carriage return
|
| \t
|
Tab
|
| \v
|
Vertical tab
|
| \f
|
Form feed
|
| \xxx
|
Octal character xxx
|
| \xhh
|
Hex character hh
|
|
| Groups and ranges
|
| .
|
Any character except new line (\n)
|
| (a|b)
|
a or b
|
| (...)
|
Group
|
| (?:...)
|
Passive group
|
| [abc]
|
Range (a or b or c)
|
| [^abc]
|
Not a or b or c
|
| [a-q]
|
Letter between a and q
|
| [A-Q]
|
Upper case letter between A and Q
|
| [0-7]
|
Digit between 0 and 7
|
| \n
|
nth group / subpattern
|
| Note: Ranges are inclusive.
|
| Pattern modifiers
|
| g
|
Global match
|
| i
|
Case-insensitive
|
| m
|
Multiple lines
|
| s
|
Treat string as single line
|
| x
|
Allow comments and white space in pattern
|
| e
|
Evaluate replacement
|
| U
|
Ungreedy pattern
|
| String replacement (backreferences)
|
| $n
|
nth non-passive group
|
| $2
|
"xyz" in /^(abc(xyz))$/
|
| $1
|
"xyz" in /^(?:abc)(xyz)$/
|
| $`
|
Before matched string
|
| $'
|
After matched string
|
| $+
|
Last matched string
|
| $&
|
Entire matched string
|
|
| Sample patterns
|
| Pattern
|
Will match
|
| ([A-Za-z0-9-]+)
|
Letters, numbers, and hyphens
|
| (\d{1,2}\/\d{1,2}\/\d{4})
|
Date (e.g., 21/3/2006)
|
| ([^\s]+(?=\.(jpg|gif|png))\.\2)
|
.jpg, .gif, or .png image
|
| (^[1-9]{1}$|^[1-4]{1}[0-9]{1}$|^50$)
|
Any number from 1 to 50 inclusive
|
| (#?([A-Fa-f0-9]){3}(([A-Fa-f0-9]){3})?)
|
Valid hexadecimal color code
|
| ((?=.*\d)(?=.*[a-z])(?=.*[A-Z]).{8,15})
|
String with at least one upper case letter, one lower case letter, and one digit (useful for passwords).
|
| (\w+@[a-zA-Z_]+?\.[a-zA-Z]{2,6})
|
E-mail addresses
|
| (\<(/?[^\>]+)\>)
|
HTML tags
|
| Note: These patterns are intended for reference purposes and have not been extensively tested. Please use with caution and test thoroughly before use.
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