Regex Tester — Live Matching, Flags & Capture Groups
Type a regex and see matches highlighted as you type. Supports global, case-insensitive, and multiline flags plus capture groups. Runs in your browser — nothing uploaded.
Keywords: regex tester, regular expression, regex debugger, pattern matching, regex validator, regex tool
Frequently Asked Questions
What regex flavor is supported?
We use JavaScript's regex engine, which follows ECMAScript standards and is compatible with most web applications.
Can I test replacement patterns?
Yes, you can test both matching and replacement operations with capture groups.
Are matches highlighted?
Yes, all matches are highlighted in the test string with different colors for capture groups.