Regex Tester — DevKit

Regular Expression

/ /

g i m s u

Replace with:

Test String

…

Per-line tests

Simplify suggestions

Use in code

Pattern library

Pattern library click any pattern to load it

Cheatsheet

Character classes

\dany digit (0-9)

\Dany non-digit

\wword char (a-z, 0-9, _)

\Wnon-word char

\swhitespace

\Snon-whitespace

.any char (except \n)

[abc]any of a, b, c

[^abc]not a, b, c

[a-z]range

Quantifiers

*0 or more

+1 or more

?0 or 1

{n}exactly n times

{n,}n or more

{n,m}between n and m

*?lazy (least)

Anchors

^start of string/line

$end of string/line

\bword boundary

\Bnot word boundary

Groups & alternation

(...)capture group

(?:...)non-capture group

(?<n>...)named group

\1backref to group 1

a|ba or b

Lookaround

(?=...)positive lookahead

(?!...)negative lookahead

(?<=...)positive lookbehind

(?<!...)negative lookbehind

Flags

gglobal (all matches)

icase insensitive

m^/$ per line

sdot matches newline

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