What regex flavors does this tester support?

This regex tester uses JavaScript's built-in RegExp engine, which supports ECMAScript regex syntax including lookahead, lookbehind, named groups, and Unicode properties.

Does the regex tester show matches in real-time?

Yes, matches are highlighted in real-time as you type your pattern. You can instantly see which parts of your test string match the regex.

Can I test regex flags like global and case-insensitive?

Yes, you can apply all standard regex flags including global (g), case-insensitive (i), multiline (m), dotAll (s), and Unicode (u) flags.

Regex Tester

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

Pattern

//g

Test String

How to Use

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

1Enter your regular expression pattern in the pattern field.
2Set flags (global, case-insensitive, multiline) as needed.
3Type or paste your test string in the input area.
4Matches are highlighted in real-time as you type.

Key Features

Real-time regex matching with highlighted results
Support for all JavaScript regex flags (g, i, m, s)
Shows match count and captured groups
Quick reference for common regex patterns

Frequently Asked Questions

Learn More

Regex Guide for Beginners — Master Pattern Matching