Regex Tester

Test regular expressions in real-time with match highlighting, capture groups, and common pattern library.

/ /
0 matches 0 groups

Need this as an API?

Use our API to integrate this tool into your applications. 100 free requests/day.

Get Free API Key

About Regex Tester

Our free online regex tester lets you test regular expressions against any text with real-time matching and capture group visualization. Works with JavaScript regex syntax, which is compatible with most languages.

Features

Real-time matching as you type, capture group highlighting, flag support (global, multiline, case-insensitive), common pattern library, and match index display.

Supported Flags

g (global), m (multiline), i (case-insensitive), s (dotAll), u (unicode). Combine flags like 'gmi' for global multiline case-insensitive matching.