Developer Utility
Regex Tester
Paste a regex pattern and test strings to see live match results. The tool highlights matched text, shows capture groups, and flags invalid patterns instantly. No server round trips — everything runs in your browser.
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Tool not found: regex-tester
How to use it
Turn the output into a validation asset.
1
Enter your regex pattern and flags.
2
Type or paste test strings in the input area.
3
Review highlighted matches, capture groups, and error messages in real time.
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