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Regex Tester

Test and debug regular expressions with real-time matching and highlighting.

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Common Patterns

About Regex Tester

Free online regex tester that lets you write and test regular expressions with real-time pattern matching and match highlighting. See captured groups, test against multiple strings, and choose from a library of common regex patterns for emails, URLs, phone numbers, and more. Supports JavaScript regex syntax with flags for global, case-insensitive, and multiline matching.

Frequently Asked Questions

What regex syntax does this tool support?▾
The tool uses JavaScript regular expression syntax, which covers the vast majority of common regex patterns. It supports flags like global (g), case-insensitive (i), and multiline (m).
Can I see captured groups in my regex matches?▾
Yes. The tool displays all captured groups for each match, making it easy to debug complex patterns with parenthesized sub-expressions and named capture groups.
Does it include common regex patterns?▾
Yes, the tool includes a library of pre-built patterns for validating emails, URLs, phone numbers, IP addresses, dates, and more. You can load any pattern with one click and customize it to your needs.

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