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From: Juri Linkov <juri@linkov.net>
Newsgroups: gmane.emacs.devel
Subject: Re: searching text only in particular blocks of text is possible?
Date: Thu, 15 Sep 2022 09:41:58 +0300
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To: Michelangelo Rodriguez <michelangelo.rodriguez@gmail.com>
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> I wish to search some text but only, for example, inside a let in all
> files of a project.
> Is it possible?

Implementing this is possible for isearch by customizing isearch-filter-predicate.
But it seems everything you need is already implemented by the package
'el-search'.