Regex Tester

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Regex Tester

Test regular expressions online with live match highlighting, built-in pattern explanation, replace preview, and a common patterns library — all local.

Pattern

Common patterns Enable replace mode

Test input

Matches

Matches (0)

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Pattern explanation

Type a pattern to see its explanation

Regex cheat sheet

Anchors

^ start of line
$ end of line
\b word boundary
\B non-word boundary
\A start of input
\Z end of input

Character classes

. any char (except newline)
\d digit (0-9)
\w word char (a-z, A-Z, 0-9, _)
\s whitespace
[abc] one of: a, b, c
[^abc] not one of: a, b, c

Quantifiers

* zero or more
+ one or more
? zero or one
{n} exactly n
{n,} n or more
{n,m} n to m

Groups

(abc) capture group
(?:abc) non-capturing group
(?<name>abc) named group
a|b alternation
\1 backreference

Lookarounds

(?=abc) positive lookahead
(?!abc) negative lookahead
(?<=abc) positive lookbehind
(?<!abc) negative lookbehind