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Regex Tester
Test regular expressions against sample text with real-time matching. Supports JavaScript regex syntax with flags.
Quick answer
A regex tester checks a regular expression against sample text and highlights matches. ClickBuildLabs uses JavaScript regular expression syntax, so it is useful for testing patterns, flags, and capture groups before using them in web code.
Regex Tester FAQ
What regex flags are supported?
We support g (global), i (case insensitive), and m (multiline) flags.
Can I see match groups?
Yes. Parenthesized groups are captured and displayed separately.
Is this compatible with JavaScript regex?
Yes. We use JavaScript regex engine, so the syntax is compatible with JS regex patterns.
Is my sample text uploaded?
No. Pattern testing happens in your browser and the sample text is not uploaded by this page.