Regex

Regex
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Common Regular Expression

Item Regex
ip address \d+\.\d+\.\d+\.\d+
Chinese [\u4e00-\u9fa5]
Email \w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*
Zipcode \d{3}((-)?\d{2})?
URL /^http://[a-za-z0-9]+.[a-za-z0-9]+[/=?%-&amp;_~@[]':+!]*([^<>""])*$/
cellphone [0-9]{4}\-[0-9]{3}\-[0-9]{3}
ipv4 cidr ^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])(\/([0-9]|[1-2][0-9]|3[0-2]))$ \
ipv6 cidr ^(([0-9a-fA-F]{1,4}:){7,7}[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,7}:|([0-9a-fA-F]{1,4}:){1,6}:[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,5}(:[0-9a-fA-F]{1,4}){1,2}|([0-9a-fA-F]{1,4}:){1,4}(:[0-9a-fA-F]{1,4}){1,3}|([0-9a-fA-F]{1,4}:){1,3}(:[0-9a-fA-F]{1,4}){1,4}|([0-9a-fA-F]{1,4}:){1,2}(:[0-9a-fA-F]{1,4}){1,5}|[0-9a-fA-F]{1,4}:((:[0-9a-fA-F]{1,4}){1,6})|:((:[0-9a-fA-F]{1,4}){1,7}|:)|fe80:(:[0-9a-fA-F]{0,4}){0,4}%[0-9a-zA-Z]{1,}|::(ffff(:0{1,4}){0,1}:){0,1}((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])|([0-9a-fA-F]{1,4}:){1,4}:((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9]))(\/(\d|[1-9]\d|1\d\d|2[0-4]\d|25[0-5]))$

Regular Expression Cheet sheet

Description Keyword
Newline \n
Carriage return \r
Tab \t
Null character \0
A single character of: a, b or c [abc]
A character except: a, b or c [^abc]
A character in the range: a-z [a-z]
A character not in the range: a-z [^a-z]
A character in the range: a-z or A-Z [a-zA-Z]
Letters and digits [[:alnum:]]
Letters [[:alpha:]]
ASCII codes 0-127 [[:ascii:]]
Space or tab only [[:blank:]]
Control characters [[:cntrl:]]
Decimal digits [[:digit:]]
Visible characters (not space) [[:graph:]]
Lowercase letters [[:lower:]]
Visible characters [[:print:]]
Visible punctuation characters [[:punct:]]
Whitespace [[:space:]]
Uppercase letters [[:upper:]]
Word characters [[:word:]]
Hexadecimal digits [[:xdigit:]]
Start of word [[:<:]]
End of word [[:>:]]
Any single character .
Alternate - match either a or b a|b
Any whitespace character \s
Any non-whitespace character \S
Any digit \d
Any non-digit \D
Any word character \w
Any non-word character \W
Any Unicode sequences, linebreaks included \X
Match one data unit \C
Unicode newlines \R
Match anything but a newline \N
Vertical whitespace character \v
Negation of \v \V
Horizontal whitespace character \h
Negation of \h \H
Reset match \K
Match subpattern number # \#
Unicode property X \pX
Unicode property or script category \p{...}
Negation of \pX \PX
Negation of \p \P{...}
Quote; treat as literals \Q...\E
Match subpattern name \k{name}
Match subpattern name \k<name>
Match subpattern name \k'name'
Match nth subpattern \gn
Match nth subpattern \g{n}
Match text the nth relative previous subpattern matched \g{-n}
Match expression defined in the nth capture group \g<n>
Match expression defined in the nth relative upcoming capture group. \g<+n>
Match expression defined in the nth capture group. \g'n'
Match expression defined in the nth relative upcoming subpattern \g'+n'
Match previously-named capture group letter \g{letter}
Match expression defined in the capture group named “letter” \g<letter>
Match expression defined in the named capture group letter \g'letter'
Hex character YY \xYY
Hex character YYYY \x{YYYY}
Octal character ddd \ddd
Control character Y \cY
Backspace character [\b]
Makes any character literal \
Match everything enclosed (?:...)
Capture everything enclosed (...)
Atomic group (non-capturing) (?>...)
Duplicate/reset subpattern group number (?|...)
Comment group (?#...)
Named Capturing Group (?'name'...)
Named Capturing Group (?<name>...)
Named Capturing Group (?P<name>...)
Inline modifiers (?imsxUJnxx)
Localized inline modifiers (?imsxUJnxx:...)
Conditional statement (?(1)yes|no)
Conditional statement (?(R)yes|no)
Recursive Conditional statement (?(R#)yes|no)
Conditional statement (?(R)name)yes|no)
Lookahead conditional (?(?=...)yes|no)
Lookbehind conditional (?(?<=...)yes|no)
Recurse entire pattern (?R)
Match expression defined in capture group 1 (?1)
Match expression defined in the first relative capture group (?+1)
Match expression defined in capture group name (?)name)
Match subpattern name (?P=name)
Match expression defined in the capture group “{name}” (?P>name)
Pre-define patterns before using them (?(DEFINE)...)
Positive Lookahead (?=...)
Negative Lookahead (?!...)
Positive Lookbehind (?<=...)
Negative Lookbehind (?<!...)
Control verb (*ACCEPT)
Control verb (*FAIL)
Control verb (*MARK:NAME)
Control verb (*COMMIT)
Control verb (*PRUNE)
Control verb (*SKIP)
Control verb (*THEN)
Pattern modifier (*UTF)
Pattern modifier (*UTF8)
Pattern modifier (*UTF16)
Pattern modifier (*UTF32)
Pattern modifier (*UCP)
Line break modifier (*CR)
Line break modifier (*LF)
Line break modifier (*CRLF)
Line break modifier (*ANYCRLF)
Line break modifier (*ANY)
Empty match modifier (*NOTEMPTY)
Empty match modifier (*NOTEMPTY_ATSTART)
JIT Modifier (*NO_JIT)
Line break modifier \R
Line break modifier (*BSR_ANYCRLF)
Line break modifier (*BSR_UNICODE)
Regex engine modifier (*LIMIT_MATCH=x)
Regex engine modifier (*LIMIT_RECURSION=d)
Regex engine modifier (*NO_AUTO_POSSESS)
Regex engine modifier (*NO_START_OPT)
Zero or one of a a?
Zero or more of a a*
One or more of a a+
Exactly 3 of a a{3}
3 or more of a a{3,}
Between 3 and 6 of a a{3,6}
Greedy quantifier a*
Lazy quantifier a*?
Possessive quantifier a*+
Start of match \G
Start of string ^
End of string $
Start of string \A
End of string \Z
Absolute end of string \z
A word boundary \b
Non-word boundary \B
Global g
Multiline m
Case insensitive i
Ignore whitespace / verbose x
Single line s
Unicode u
eXtra X
Ungreedy U
Anchor A
Duplicate group names J
Contents in capture group 1 $1
Contents in capture group foo ${foo}
Hexadecimal replacement values \x20
Hexadecimal replacement values \x{06fa}
Insert a tab \t
Insert a carriage return \r
Insert a newline \n
Insert a form-feed \f
Uppercase Transformation \U
Lowercase Transformation \L
Terminate any Transformation \E

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