Test regular expressions with live match highlighting, capture groups, and replacement
Our Regex Tester is a powerful online tool for testing and debugging regular expressions. Perfect for developers who need to validate regex patterns, visualize matches, and understand capture groups.
Features: Live match highlighting, capture group display, multiple regex flags (global, case-insensitive, multiline, dotall, unicode), replace functionality with group references ($1, $2), common pattern library, match count, position tracking, and a comprehensive regex cheat sheet. Test email validation, URL matching, phone numbers, dates, and more.
How to use: Enter your regex pattern, select flags, and paste your test string. Matches are highlighted in real-time with detailed information about each match and capture groups. Use the replace feature to test substitutions, or explore the cheat sheet to learn regex syntax.