Online Regular Expression (Regex) Tester

The tool uses the built-in JavaScript RegExp engine running in your browser. The syntax is compatible with V8 (Node.js, Chrome). Named groups (?<name>...), lookahead (?=...), lookbehind (?<=...) and other modern features are supported.

The g (global) flag makes the regex find all matches in the text instead of stopping at the first one. Without the g flag, only the first match will be found.

Wrap part of the pattern in parentheses: (\d+) will capture digits. Named groups: (?<year>\d{4}) let you reference the result by name. Groups are displayed in the matches list below the test text.