Regex tester

Try a regular expression on your text and see every match and group as you type.

Runs in your browser

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About Regex tester

Regex tester runs a JavaScript regular expression against your text and highlights every match as you type. It lists each match with its position, numbered and named capture groups, supports all flags, and previews the result of a replacement with $1-style references.

Live highlighting of every match
Capture groups and named groups listed
Replace preview with $1 and $<name>

How to use Regex tester

1Type a pattern and choose flags.
2Paste the text to test.
3Check the highlighted matches and groups, or preview a replacement.