Regex Tester
100% Client-Side Private — Zero Server Uploads
Test regular expressions with live highlighting, match details, and preset patterns.
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Flags:
How do I use Regex Tester?
1
Enter a regex pattern in the pattern field.
2
Set flags (g, i, m, s, u) as needed.
3
Paste or type test text.
4
View highlighted matches and detailed results.
What features does Regex Tester offer?
Live Testing: Results update as you type.
Match Highlighting: Visual match preview in test text.
Named Groups: Support for regex named capture groups.
Preset Patterns: Common patterns for email, URL, IP, phone.
Frequently Asked Questions about Regex Tester
What regex flavor is used?
JavaScript (ECMAScript) RegExp engine, which supports named groups, lookbehind, and Unicode.
Is there a match limit?
Results are capped at 10,000 matches to prevent browser freezing.
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