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Test expressions with live match details.
Add an input and run this tool to see the output.
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Tool overview
Check a regular expression against sample text while reviewing matches and groups. Use the tester for development and debugging, not as a formal ReDoS proof.
What this tool supports
- Tests a pattern against input text in the browser.
- Shows match details and capture information as you iterate.
- Input and pattern complexity guards reduce common excessive-backtracking risks.