Besides Procmon the tool next "hammer" on my toolbelt is ripgrep. If you need to search in a local codebase I can highly recommend installing it (adding it to your PATH on windows) and then just "rg" for any text. It's blazingly fast!
Pitfall: it obeys .gitignore (and other ignore) files and if you need to search in ignored files as well add the --no-ignore option.
Get it from the releases of https://github.com/BurntSushi/ripgrep

