Free Regex Tester

Test regex expressions with live match reporting.

Regex Tester

Test regex patterns against input strings.

How to Use

Enter pattern, flags, and test string.
Optionally set replacement text to preview replace output.
Review match indexes, capture groups, and replacement preview.

Workflow Notes

Presets are included for common email/date/repeated-word patterns.
Global flag affects whether single or multiple matches are reported.
Group output helps debug capture behavior quickly.

Common Use Cases

Validate pattern behavior before shipping production regex rules.
Inspect capture groups and replacement behavior quickly.
Debug edge-case match ranges in messy text data.

FAQ

Does this regex tester support capture groups?

Yes. Captured groups are listed under each match when present.

Can I preview replacement results?

Yes. Add replacement text to generate a replacement preview from the same pattern and flags.

What regex engine is used?

This route uses JavaScript RegExp behavior in your browser environment.

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