Regex Tester – Test, Highlight & Explain
Regex Tester – Test, Highlight & Explain
Validate and explain regex without risking slow matches.
Explain regex
\w: Word char
\b: Word boundary
.: Any char
+: One or more
\.: Literal dot
[]: Character class
{}: Quantifier
Matches
No matches yet.
Test text
Emails:
jane@example.com
john.doe@acme.co.uk
URLs:
https://omnvert.com
http://localhost:3000/test
Other developer tools
About
Test patterns with flags, highlights, replacements and quick explanations of common tokens. Safe execution with timeouts.
FAQ
›Which flags can I use?
Global, ignore case, multiline, dotAll, unicode and sticky flags are supported.
›How do you prevent ReDoS?
Execution happens in a Web Worker with length limits and a 150 ms timeout.
›Can I see capture groups?
Yes. Matches list includes index and captured groups per result.
›How does replace work?
Provide a replacement string; we show the transformed text and let you copy it.
›What does explain regex do?
We map common tokens (\d, \w, +, ?, ^, $, [], (), |, etc.) to short English/Turkish hints.