Regex Tester & Groups
Test regular expressions against sample text with live match preview, capture group extraction, named groups, and flag controls. Free by Graph Tools.
Use this free regex tester to test regular expressions against any sample text. See live match highlights, extracted capture groups, named group values, and match counts as you type. Supports JavaScript regex flags (global, case-insensitive, multiline, sticky, dotAll). Useful for API input validation, log parsing, and building string extraction patterns.