Regex Tester

Live JavaScript regex matcher. Capture groups highlighted. Useful for ACL pattern crafting, SIEM rule writing, log parsing.

Pattern

/ /

\d

digit · \D non-digit

\w

word char (a-z, A-Z, 0-9, _) · \W non-word

\s

whitespace · \S non-whitespace

.

any char (except newline)

^ $

start / end (use m flag for per-line)

* + ?

0+, 1+, 0 or 1 · add ? for lazy

{n,m}

between n and m repetitions

(...)

capture group · (?:...) non-capture · (?P<name>...) named

[abc]

char class · [^abc] negated · [a-z] range

(?=...)

lookahead · (?!...) neg · (?<=...) lookbehind

Flags

g global · i case-insensitive · m multiline · s dotall · u unicode