Find file in a project in a mono-repo like `projectile-find-file`

Question

My code base consists of a "mono-repo". A single large repository containing a flat structure of projects.

Top
  Project1
  Project2
  Project3
  Library
  Library

I've been using Projectile to navigate this so far, but I'm starting to get to the point where I want to be able to search within a given library or project. I have a function that will return the root of a library or project.

How can I use projectile-find-file, or something like it, within one of these projects?

Work so far

I found the following command (helm-find-1 (my-mono-find-root)) that does something close to what I want. I'd quite like it to ignore some files tho.

Answer 1

To look within a particular project, I often use ag. It is a front end for The Silver Searcher which allows you to recursively search a directory for a regexp in a file or filename. The ag package presents a nice list of matches with links to their source. Similar packages exist for grep ((emacs) Grep Searching or via C-h i d m emacs <RET> m Grep Searching) and ripgrep (rg.el).