Regex Tester
Test and debug regular expressions with live match highlighting.
Three steps, no reading required.
Write your pattern
Type your regular expression between the slashes and set flags like g, i, m.
Add test text
Paste the text you want to match against into the test pane.
Read the matches
Matches highlight live and capture groups are listed below — then copy them.
Try it with a sample.
/\b[\w.+-]+@[\w-]+\.[\w.-]+\b/g Contact us at [email protected] or [email protected].
/#(?:[0-9a-fA-F]{3}|[0-9a-fA-F]{6})\b/g
Brand blue is #2563EB, accent green #22C55E, short form #abc.Upload & hope
- Sends your input to a server to process it
- Asks for an account after a few free uses
- Limits input size on the free tier
Runs where you are
- Processes everything inside your browser tab
- No account, ever
- No artificial size limit
Questions worth answering upfront.
No. Matching runs entirely in your browser using the native JavaScript regex engine. Nothing you enter is uploaded or stored.
It uses the JavaScript (ECMAScript) regular expression engine, including flags like g, i, m, s and u.
Yes. Matches are highlighted in your test text as you type, and capture groups are listed for inspection.
Yes. Common patterns such as email, URL and date are available to start from and adapt.
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