https://github.com/niklongstone/regular-expression-cheat-sheet

Regular Expression Cheat Sheet - PCRE
https://github.com/niklongstone/regular-expression-cheat-sheet

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Regular Expression Cheat Sheet - PCRE

• Host: GitHub
• URL: https://github.com/niklongstone/regular-expression-cheat-sheet
• Owner: niklongstone
• Created: 2015-07-05T08:21:36.000Z (about 9 years ago)
• Default Branch: master
• Last Pushed: 2021-09-19T08:01:50.000Z (about 3 years ago)
• Last Synced: 2024-07-20T01:25:39.008Z (2 months ago)
• Size: 1.95 KB
• Stars: 286
• Watchers: 7
• Forks: 85
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# Regular Expression Cheat Sheet - PCRE 

|Anchor|Description|Example|Valid match|Invalid|

:---|:---|:---|:---|---

^|start of string or line|^foam|foam|bath foam|

\A|start of string in any match mode|\Afoam|foam|bath foam|

$|end of string or line|finish$|finish|finnish|

\Z|end of string, or char before last new line in any match mode|finish\Z|finish|finnish|

\z|end of string, in any match mode.|

\G|end of the previous match or the start of the string for the first match|\^(get\|set)\|\G\w+$|setValue|seValue

\b|word boundary; position between a word character (\w), and a nonword character (\W)|\bis\b|This island is beautiful|This island isn't beautiful

\B|not-word-boundary.|\Bland|island|peninsula

|Assertion|Description|Example|Valid match|Invalid|

:---|:---|:---|:---|---

(?=...)|positive lookahead|question(?=s)|questions|question

(?!...)|negative lookahead|answer(?!s)|answer| answers

(?<=...)|positive look-behind|(?<=appl)e|apple|application

(?...)|subpattern, and capture submatch into *name*|`(?Phello)`|hello|hallo

(?:...)|subpattern, but does not capture submatch|(?:hello)|hello|hallo

+| one or more quantifier|ye+ah|yeah, yeeeah|yah  

*| zero or more quantifier|ye*ah|yeeah, yeeeah, yah|yeh 

?| zero or one quantifier|yes?|yes, ye|yess  

??| zero or one, as few times as possible (lazy)|yea??h|yeah|yeaah|

+?| one or more  lazy |`/<.+?>/g`|`
foo
` matches only `
` and `
`|  

*?| zero or more, lazy|`/<.*?>/g`|``|

{n}|n times exactly|fo{2}|foo|fooo

{n,m}|from n to m times|go{2,3}d|good,goood|gooood

{n,}|at least n times|go{2,}|goo, gooo|go

(?(condition)...)|if-then pattern|`(<)?[p](?(1)>)`|`
`, p|