JavaScript regex multiline flag doesn't work

Question

I wrote a regex to fetch string from HTML, but it seems the multiline flag doesn\'t work.

This is my pattern and I want to get the text in h1 tag.

Answer 1

The dotall modifier has actually made it into JavaScript in June 2018, that is ECMAScript 2018.
https://github.com/tc39/proposal-regexp-dotall-flag

const re = /foo.bar/s; // Or, `const re = new RegExp('foo.bar', 's');`.
re.test('foo\nbar');
// → true
re.dotAll
// → true
re.flags
// → 's'