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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: How can i search for lines which wrap?
Date: Fri, 09 Jul 2021 09:36:47 +0300
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> Date: Thu, 8 Jul 2021 22:12:48 -0700
> From: 2QdxY4RzWzUUiLuE@potatochowder.com
> 
> > So what i was missing was an easy way to search to the end of the next line
> > with 80 or more characters.
> 
> The regular expression .\{80\}$ matches the end of lines consisting of
> 80 or more characters.

Caveat: this assumes that each character takes up just one column on
display.  That assumption can be false, because there are zero-width
characters and wide characters.