[email protected]supporttoolz.dev[email protected]salestoolz.dev[email protected]litonpixarlabs.io[email protected]billingexample.comA Regex Tester lets you write a regular expression, run it against sample text, and see exactly what it matches in real time. Every match is highlighted in place, each capture group is listed with its value and position, and syntax errors in your pattern are reported with the engine's exact message — so you can debug a pattern in seconds instead of pasting it into your code and re-running your program.
Regular expressions are compact but unforgiving: a missing escape, a greedy quantifier, or a misunderstood character class can make a pattern match nothing, match too much, or throw an error. This tester uses the same JavaScript RegExp engine your browser and Node.js run, so the behavior you see here is the behavior you get in production code. Toggle the g, i, m, s, u, and y flags to see how each one changes the result.
Everything runs 100% in your browser. Your patterns and test data — which often include real log lines, user records, or proprietary formats — are never uploaded or stored. The tool works offline once loaded, so you can test expressions on sensitive data without it ever leaving your device.
Type or paste a regular expression into the pattern field — write it without the surrounding slashes, just the expression itself. Click Load Sample to start from a working email-matching example.
Toggle flags like g (global — find all matches), i (case-insensitive), m (multiline anchors), and s (dot matches newlines) to control how the pattern is applied.
Paste the text you want to search into the test area. Matches update live as you edit either the pattern or the text.
See every match highlighted inline, review the numbered and named capture groups for each match, and copy the finished /pattern/flags expression when you are done.
Every match is highlighted directly in your test text as you type, with alternating colors so adjacent matches stay distinct
Numbered and named capture groups are listed per match with their captured values, so you can verify what each part of the pattern extracts
Toggle all six JavaScript flags — global, ignore-case, multiline, dotAll, unicode, and sticky — and see the effect immediately
Invalid patterns are caught and reported with the JavaScript engine's exact error, pointing you straight at the syntax problem
Build, test, and debug regular expressions with real-time matching and a comprehensive cheatsheet
Compare two texts and find differences. Highlight additions, removals, and common parts with word or character level comparison.
Format, validate, and minify JSON data
0 comments
No comments yet. Be the first to share your thoughts!