Regex tester

Pattern

Flags: g all, i ignore case, m multiline, s dot matches newline, u unicode.

Test text

Replace with

Questions

Which regex flavor is this?

JavaScript (ECMAScript). Most patterns also work in Python, PHP and Java, but lookbehind and named groups differ slightly.

How do I match across lines?

Use the m flag so ^ and $ match at each line, or the s flag so . also matches newlines.

Is my text sent anywhere?

No. Everything runs in your browser.