JavaScript regex multiline text between two tags

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.

var pattern= /<div class="box-content-5">.*<h1>([^<]+?)<\/h1>/mi
m = html.search(pattern);
return m[1];

I created a string to test it. When the string contains “\n”, the result is always null. If I removed all the “\n”s, it gave me the right result, no matter with or without the /m flag.

What’s wrong with my regex?

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