Where does processing happen?
You submit input from this page. Utiline runs the tool on secure servers—heavy parsing and crypto never ship to your browser.
Inspect · Regex tester
Test and match regular expressions online
Iterate on patterns with instant match results before you ship code or regex in production.
- Test and find-matches modes
- Common regex flags
- Match limits on free tier
Pattern matching
Secure processing, simple download.
You upload from this page (or paste input for instant tools). Utiline processes your request in the cloud and gives you a link to download the result—nothing heavy runs in your browser.
When to use Regex tester
Built for everyday file work.
- Check a pattern before shipping
- Extract groups from log lines
- Learn regex with live output
Pattern and text are required. The match mode supports a maximum number of matches.
Instant result
Run Regex tester
Paste or type your input below and run the tool. Processing happens on Utiline's servers—your browser only sends the request and shows the answer.
Soft input cap: 32 KBSession: anonymousRuns instantly
FAQ
Regex tester questions
Which regex engine is used?
Python-style regular expressions on Utiline servers, consistent with the developer automation endpoints.
Is my pasted input sent to analytics?
No. Optional analytics records only which tool you used and run status. What you paste never goes to analytics—only the result shown on this page.
Can I automate this in production?
Yes. See the developer quickstart for API keys, usage metering, and higher limits in production.