Check domains existence and get code from the homepage

Question

I would like to check the existence of all domains of the TLD ".ch".

Then, in the existing ones, I would like to check for a term,

for example meta name="robots" content="index,follow"

(could also be others)

Thanks

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These questions and answers were helpful but didn't answer my question:

(found it with "+check +existence +domains")

Domain name existence via "dig"

Fast concurrent checking of SOA DNS records for .co.za domains

Checking domain name availability with DNS records