How do I test a regular expression against text online for free?

Enter your regex pattern and your test string above. All matches are highlighted in real time as you type. You can toggle flags (global, case-insensitive, multiline, dotall) and inspect individual match groups without writing any code.

What regex flags does the tester support?

The tester supports all standard JavaScript regex flags: g (global — find all matches, not just the first), i (case-insensitive), m (multiline — ^ and $ match line boundaries), and s (dotall — the . character matches newlines as well).

Does the regex tester show all matches or only the first one?

With the g (global) flag enabled, the tool finds and highlights all matches in the test string. Without the g flag, only the first match is highlighted. Match count and individual group captures are displayed below the output.

Does the regex tester support named capture groups?

Yes. Named capture groups using the (? ...) syntax are supported since the tool runs in the browser's JavaScript regex engine, which fully implements ECMAScript 2018 named groups. Captured group names and values are displayed alongside each match.

Is the online regex tester free?

Yes — free, no account, runs entirely in your browser. Regex evaluation is done by the JavaScript engine — nothing is sent to a server.

regex

Regex Tester

Test regular expressions with live match highlighting. Toggle flags and see all matches instantly.

Your files are processed locally and never uploaded to our servers.

Regular expression

//g

Test string

How it works

1
Type or paste input
Paste your value into the input field. No file needed — works directly in your browser.
2
Get instant results
The result appears in real time as you type. No server, no upload.
3
Copy the output
Click the copy button to copy the result to your clipboard instantly.

Frequently Asked Questions

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