🔤 Regex Tester

Test regular expressions live against sample text — with match highlighting, capture groups, a replace preview and a cheatsheet of common patterns. JavaScript flavour, 100% client-side.

Pattern

Replace with

g — global i — ignore case m — multiline s — dotall u — unicode

Test text

Live preview & matches

Replace result

Common patterns

Click to load into the pattern field.

Tip The tester uses JavaScript's RegExp. Patterns are applied live as you type — press Test or just keep editing. Nothing is ever uploaded.