Regex Tester
Build, test and debug regular expressions. Live-match highlighting, groups, replace and export results.
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Matches
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Capture Groups
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Last Index
Tip: Use capture references like $1, $2 in the replacement field.
About Our Tool
This Regex Tester helps developers, QA and content editors build and validate regular expressions quickly with live highlighting and detailed match info. It runs completely in your browser.
Features
- Live match highlighting in the preview text
- Show match indices and captured groups
- Replace all matches using group references ($1, $2)
- Copy results to clipboard and download as .txt
Common Uses
- Test and refine regex for data extraction
- Clean or transform text using replace patterns
- Validate patterns for form inputs and parsing
How to Use
- Enter your regex pattern (without delimiters).
- Select flags (g, i, m, s, u, y) as needed.
- Paste the test text and click Test / Find Matches.
- See highlighted matches and groups; use Replace All to produce transformed text.
- Copy or download the results.