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A quick way to understand who this helps, what it solves, and where it connects next.
Developers, technical founders, operators, and power users testing small regex patterns quickly.
Fast JavaScript regex checks when the job is matching and group inspection, not a full replace workflow.
Capture regex-tester-lite intent with an honest JavaScript-only regex tester.
Cleanor Labs
These sections explain the job in plain language and set expectations for what the tool should do well.
To use Regex Tester Lite, type your JavaScript regular expression into the pattern field, add any flags such as g, i, or m, and paste the text you want to test against. The tool compiles the pattern and shows you the matches and capture groups it finds, updating as you edit.
If the pattern is invalid, the tool reports a clear compile error instead of failing silently, so you can fix the syntax quickly. Everything runs locally in your browser, so the patterns and text you test never leave your device.
This is handy for validating input formats, checking a search-and-replace pattern, or confirming a tricky group structure before you drop the regex into your code.
Regex Tester Lite is intentionally narrow and honest about scope. It focuses on JavaScript regular expression compiling and match inspection, which covers the most common day-to-day regex checks for web developers.
It is match-focused, so it does not include a replace mode, and it tests the JavaScript engine only rather than other flavors like PCRE or Python. That keeps the interface fast and uncluttered for the cases it is built to handle.
Short answers for the questions people usually have before trying a utility like this.
Yes. Regex Tester Lite is free to use with no account, and it runs entirely in your browser.
No. The regex and test text are processed locally in your browser, so nothing is uploaded and your data stays on your device.
Regex Tester Lite tests JavaScript regular expressions only. It does not support other engines like PCRE or Python in this version.
No. This version is match-focused: it inspects matches and capture groups but does not perform search-and-replace.
Yes. If a pattern is invalid, the tool reports a clear compile error so you can fix the syntax instead of guessing.
Every tool on Cleanor is free with no sign-up, no credits, and no limits. Files are processed privately in your browser. Looking for on-device phone cleanup and Premium features? That lives in the Cleanor app.
Enter a JS regex pattern, optional flags, and test text to review matches, capture groups, and compile errors locally.