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Regex Tester

Try a JavaScript regular expression against sample text. See matches and groups instantly.

Pattern

Flags

Text

Replace with

JS cheatsheet: \d \w \s \b * + ? (?: ) (?= ) [a-z] {'{'}n,m{'}'}

How to test a regex

Type a pattern and optional flags.
Paste the text to test.
Read matches and groups.

Frequently asked questions

Which engine?

Your browser’s JavaScript RegExp, not PCRE or Python.

Catastrophic backtracking?

A huge input plus a nasty pattern can freeze the tab. Keep tests small.

Replacement?

A replace field shows the substituted string.

Private?

Yes.

Cheatsheet?

A short JS-regex reminder is on the page.

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