Regexp Cheat Sheet

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RegExp

Character classes

Pattern Description

. Any character, except newline

\w Word

\d Digit

\s Whitespace

\W Not word

\D Not digit

§ Not whitespace

[abc] Any of a, b, or c

[a-e] Characters between a and e

[1-9] Digit between 1 and 9

[abc] Any character except a, b or c

Anchors

Pattern Description

\G Start of match

^ Start of string

$ End of string

\A Start of string

\Z End of string

\z Absolute end of string

\b A word boundry

\B Non-word boundry

^abc Start with abc

abc$ End with abc

Escaped characters

Pattern Description

\. \* \\ Escape special character used by regex

\t Tab

\n Newline

\r Carriage return

Groups

Pattern Description

(abc) Capture group

(a|b) Match a or b

(?:abc) Match abc, but don’t capture

Quantifiers

Pattern Description

a* Match 0 or more

a+ Match 1 or more

a? Match 0 or 1

a{5} Match exactly 5

a{,3} Match up to 3

a{3,} Match 3 or more

a{1,3} Match between 1 and 3

Lookahead & Lookbehind

Pattern Description

a(?=b) Match a in baby but not in bay

a(?!b) Match a in Stan but not in Stab

(?<=a)b Match b in crabs but not in cribs

(?<!a)b Match b in fib but not in fab

source: regexp cheat sheet