GUIDE · 2026-07-22
How to use the Regex Tester
Safely try a regular expression on your own sample. The result follows “Pattern + flags → match list” and is designed for situations such as test an email pattern. Inputs are handled immediately in your browser with no account required.
How it works
Pattern + flags → match list
Most processing stays in your browser instead of sending inputs to our server. Verify important financial or contractual decisions against an authoritative source.
Useful examples
- Test an email pattern
- Extract values from logs
- Inspect matches before replacing
Frequently asked questions
What happens with an invalid pattern?
The tool stops and shows the error.
Does it support global matching?
Use the g flag to list all matches.