Regex Tester
Runs a regular expression against sample text and shows matches. It is for checking patterns before using them in code, search, or cleanup tasks.
Runs in your browser. Input, settings, and results are not sent to Utilio servers.
Regex Tester
Local browser processing. Data stays on this device.
2 Matches
2 matches
The regex was tested against 71 characters. Matches: 2, with a replacement preview below.
0: Utilio38: utilioWhat Regex Tester does
Use Regex Tester when you need to test a pattern against realistic sample strings.
When to use it
- Test a pattern against realistic sample strings.
- Check flags, groups, and repeated matches.
- Debug cleanup rules before running them over real data.
How to use it
- Paste the sample text and regex pattern.
- Adjust flags and inspect matches.
- Copy the pattern only after testing edge cases.
What to check
- Browser regex behavior follows JavaScript rules.
- Avoid catastrophic patterns on very large inputs.
Data, formats, and limits
What stays on your device and what is sent
Runs in your browser. Input, settings, and results are not sent to Utilio servers.
Supported formats
This tool works with typed or generated values rather than uploaded files.
File limits and browser requirements
- Use an up-to-date browser and check the result on the device where you will use it.
Known limits
- This tool helps inspect or transform data, but it does not replace code review, security review, or production configuration checks.
- Do not paste real secrets, tokens, or private keys into data you are not prepared to expose in the browser.
Troubleshooting
- If validation fails, start with quotes, commas, brackets, whitespace, and input encoding.
- If the result is unexpectedly empty, check the tool mode and a minimal example without extra fields.
- Do not paste real tokens, passwords, or keys; use a test snippet with the same format for diagnosis.
Common questions
What does Utilio receive?
Runs in your browser. Input, settings, and results are not sent to Utilio servers.
What is it useful for?
Use it when you need to test a pattern against realistic sample strings. Start by pasting the sample text and regex pattern.
Do I need an account?
No. You can use this tool without creating an account.
Can I use it on a phone?
Yes. The tool works in a mobile browser, though longer input or detailed results may be easier to review on a larger screen.
How do I get a reliable result?
Paste the sample text and regex pattern. Then adjust flags and inspect matches. Browser regex behavior follows JavaScript rules.
Does Utilio use my input or results to train AI?
No. Utilio does not use files, pasted text, settings, generated values, or results from this tool to train AI models.