Results
Enter a pattern and some text to start.
Check patterns before shipping them
This tool runs fully in the browser so you can validate patterns, flags, and capture groups without uploading text.
Regex tester online
Test regex patterns in your browser, toggle g, i, and m flags, inspect matches and groups, and copy results instantly.
What this regex tester is useful for
Use it to validate regular expressions before moving them into forms, scripts, filters, data parsing, or cleanup flows.
Common uses
Where regex usually helps
Validate input
Check emails, URLs, IDs, and custom formats before adding the expression to a real app.
Search patterns
Useful for finding routes, params, codes, tags, or repeated fragments inside a block of text.
Clean content
Also handy when preparing replacement rules, parsing logic, or extraction flows.
FAQ
Questions about the regex tester
Can I test flags like g, i, and m?
Yes. You can toggle each flag in the interface and see how the result changes immediately.
Does it show captured groups?
Yes. The summary shows how many matches were found and how many capture groups the pattern exposed.
Is any text sent to a server?
No. Everything runs in the browser.
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