Which flags are supported?

Global (g), case-insensitive (i), multiline (m), dotall (s), and unicode (u).

Can I see capture groups?

Yes, each match displays numbered and named groups.

Yes, all processing is done in your browser's JavaScript engine.

🇬🇧WebFileTools/Regex Tester

Test and debug regular expressions in real time with match highlighting. 100% browser-based.

Regular Expression

//g

Test String

WebFileTools Regex Tester lets you validate and debug regular expressions with instant visual feedback.

Enter your regex and test string. Matches are highlighted in real time with group details.

Which flags are supported?: Global (g), case-insensitive (i), multiline (m), dotall (s), and unicode (u).
Can I see capture groups?: Yes, each match displays numbered and named groups.
Does it work offline?: Yes, all processing is done in your browser's JavaScript engine.

Validate, format, and minify JSON. Syntax highlighting and file import. 100% in the browser.

Compare two texts and visualize differences line by line. Additions, deletions, modifications. Free.

Encode/decode text or a file to Base64. Data URL and one-click copy. 100% in the browser.