REGEX · TESTER · CLIENT-SIDE
Regex Tester Online
Test JavaScript regular expressions against sample text and see matches locally in your browser.
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freeclient-sideno accountno upload workflow
How to test a regex
Use this for the quick job: paste input, get output, copy the result, and leave without signing up for another tiny software prison.
- Paste a JavaScript regex pattern and optional flags.
- Paste the sample text you want to test against.
- Review match results and copy them if needed.
Best use cases
- Checking patterns for form validation, log parsing, quick scripts, and docs.
- Finding match positions before dropping a regex into code like a cursed little spell.
- Testing simple flags such as g, i, and m without opening a full IDE.
Privacy and limits
- Runs client-side in your browser.
- No account or login required.
- No upload step for the text you paste into the tool.
- This uses JavaScript regex behavior, not PCRE, Python, Java, or every engine in the regex swamp.
- Catastrophic patterns can still be slow. Regex remains regex. Sorry.
When the free tool is not enough
The free page is for one-off paste-and-copy work. If you are converting files repeatedly, use VXRGE Batch Tools: the paid offline bundle for local batch CSV, JSON, YAML, line cleanup, and Base64 file work.
FAQ
Which regex engine does it use?
JavaScript regular expressions in the browser.
Is the sample text uploaded?
No. Testing runs client-side.
Can it explain regex patterns?
Not yet. It lists matches; explanation can be added later if useful.