Developer utilities

Regex tester

Test and debug regular expressions in real time. Enter a pattern, toggle flags, and see highlighted matches with capture groups and match positions instantly.

Regular expression

Flags:

Test string

Add a test string above to see matches.

Regex Tester Guide: Test, Debug, and Master Regular Expressions

Read guide

Frequently Asked Questions

What is a regex tester used for?

What regex flags does this tester support?

How do capture groups work in the results?

Why does removing the g flag change the number of matches?

Does this work with lookaheads, lookbehinds, and named groups?