Developer

Regex Tester

Test regular expressions with live match highlighting.

//g

Flags:g=global · i=case-insensitive · m=multiline · s=dotAll

Quick:

Test string

Matches

Highlighted matches appear here…

Uses JavaScript's RegExp engine. Matches are highlighted in real time.

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Frequently asked questions

Which regex engine is used?

The tool uses the JavaScript RegExp engine, which follows the ECMAScript specification.

Does it show capture groups?

Yes. Named and numbered capture groups are displayed with their matched values.

Is my data sent to a server?

No. All matching runs securely in your browser without uploading.

How to test a regular expression online for free

Write and test regex patterns with live match highlighting securely in your browser without uploading.

Enter your pattern — Type the regular expression in the pattern field and set flags (g, i, m) if needed.
Paste test text — Enter the text you want to match against in the test input.
Review matches — Matches are highlighted in real time. Capture groups are shown below.

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