How do I search for usage of a generator?

Ideally, I’d like to end up with all domains using Discourse.

Most discourse instances have a meta tag with Discourse’s verion, beginning with <meta name="generator" content="Discourse.

I would get multiple results per domain, if I just searched with the tag in double quotes. How do I search for all domains, not pages for a meta tag?

I have no preference over what search engine to use or if the interface is programmatic or not.

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Author: u15p7fgy863eiq5