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Regex Builder & Tester
Visual Regex Builder & Tester
Build regular expressions visually with blocks and test matches in real-time. 100% client-side operations.
100% Offline
Business
Quick Tokens
Click a token below to append it to your active regex pattern:
Cheat Sheet
.
Any single char
a|b
Either a or b
(...)
Capture Group
(?:...)
Non-capture Group
\b
Word Boundary
(?=...)
Positive Lookahead
Expression Editor
Valid Regex
/
/
Test Text
Real-Time Highlights
Language Snippets
// JS loading...Matches Summary
0
Total Matches
0
Groups/Match
Matches List
No active matches found. Enter valid expression and text inputs.
Frequently Asked Questions
Quick direct-answer guides about using this utility tool locally and securely.
Does the visual regex builder transmit my test text to any servers?
No, the regular expression execution and match highlighting are executed entirely client-side using your browser's built-in V8 Javascript regular expression engine. Your sample text is never uploaded.
What regular expression standard is used for matching?
The tool uses standard Javascript RegExp specs. Minor variations might exist compared to PCRE (PHP) or Python's `re` engine, but the core token syntax remains identical.