What regex flavors are supported?

QuickNib uses JavaScript's native RegExp engine, which supports most common regex features including lookahead and lookbehind.

Regex Tester

Last verified working: March 2026

Write and test regular expressions with instant visual feedback. See matches highlighted in your text, view capture groups, and test with different flags.

Regular Expression

Test String

How to Use Regex Tester

Paste or enter your data in the input field above.
The result appears instantly — no button press needed.
Copy the output to your clipboard with one click.

Frequently Asked Questions

What regex flavors are supported?: QuickNib uses JavaScript's native RegExp engine, which supports most common regex features including lookahead and lookbehind.