Free Regex Tester and Formatter
Test regex patterns, inspect matches, and format expressions for readability.
No uploads. No servers. No account required.
100% Private - Input Never Leaves Your Device
Regex compilation, matching, and formatting run locally in your browser only.
Regex Tester
Matches update automatically while you type.
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Supports JavaScript replacement tokens like $1, $2, $<name>, $&, and $$.
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Saved Snippets
Regex Formatter
Formatting is for readability only and does not change your active test pattern.
Quick Reference
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How to Use
- Enter a regex pattern and select needed flags.
- Type test string input and review highlighted matches.
- Use replace preview, explanation, and snippets for reuse.
Example: Find all invoice IDs and preview replacement output safely. See full use case.
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