Question 1

Does this tool send my text to a server?

Accepted Answer

No. Everything runs locally in your browser (client-side only).

Question 2

Which regex engine does this use?

Accepted Answer

It uses the JavaScript RegExp engine available in your browser.

Question 3

How do I match two uppercase letters followed by digits?

Accepted Answer

Use ^([A-Z]{2})(\d+)$ to match the whole string. Add the i flag or use [A-Za-z]{2} for case-insensitive letters.

Question 4

How do I enable multiline or dotall?

Accepted Answer

Use flags: m for multiline, s for dotAll, i for case-insensitive, g for global.

Regex Inputs

Highlighted Output