Regex Tester – Test Regular Expressions Online
Free online regex tester with real-time match highlighting, capture groups, and flags (g, i, m, s, u). Paste your pattern and test string to see every match instantly, plus a quick reference of common patterns for email, URL, IP, date and more. No sign-up, data never leaves your browser.
Flags
Match list
| # | Match | Position | Groups |
|---|
Common patterns
Matching runs entirely in your browser using the JavaScript RegExp engine — nothing is uploaded. Note that JS regex differs slightly from PCRE/Python (e.g. no \A \z anchors or atomic groups); results apply to JavaScript and most modern languages.