Build, test, and debug regular expressions in real time. Matches highlight instantly as you type, with detailed match info and a built-in quick reference.
Matches highlight in real time as you type your pattern — no button press needed. Instant feedback on every keystroke.
Every match is highlighted directly in your test string so you can see exactly what your pattern is capturing at a glance.
See every match listed with its value, index position, and length. Named capture groups are shown separately.
Toggle global, case-insensitive, multiline, dotall, unicode, and sticky flags with one click — no need to remember the letters.
Built-in cheat sheet of common regex tokens. Click any token to insert it directly into your pattern.
Your patterns and test strings never leave your browser. Safe to test against real data and sensitive strings.