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Regex Cheat Sheet

A complete reference for JavaScript regular expression syntax. Click any token to try it in the regex tester.

Character Classes

.Any character except line terminators \dDigit (0-9)\DNot a digit \wWord character (a-z, A-Z, 0-9, _)\WNot a word character \sWhitespace and line terminator characters \SNot whitespace [abc]Any of a, b, or c [^abc]Not a, b, or c [a-z]Character range a to z

Quantifiers

*Zero or more +One or more ?Zero or one (optional){n}Exactly n times {n,}n or more times {n,m}Between n and m times *?Zero or more (lazy)+?One or more (lazy)??Zero or one (lazy)

Anchors

^Start of string (or line with m flag)$End of string (or line with m flag)\bWord boundary \BNot a word boundary

Groups & References

(abc)Capturing group (?:abc)Non-capturing group (?<name>abc)Named capturing group \1Backreference to group #1 \k<name>Backreference to named group (a|b)Alternation (a or b)

Lookaround

(?=abc)Positive lookahead (?!abc)Negative lookahead (?<=abc)Positive lookbehind (?<!abc)Negative lookbehind

Escape Sequences

\\Literal backslash \nNewline \rCarriage return \tTab \0Null character \xhhHex character \uhhhhUnicode character

Flags

gGlobal: find all matches iCase-insensitive mMultiline: ^ and $ match line boundaries sDotAll: . matches any character uUnicode: treat input as Unicode code points vUnicode sets: extended character classes dIndices: capture start/end positions

Replacement Tokens

$1, $2...Captured group by number $<name>Captured group by name $&Entire match $`Text before the match $'Text after the match $$Literal dollar sign

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