I work on code bases with millions of lines, so I wrote a tool called Septum to help me (https://github.com/pyjarrett/septum/). This isn't to replace grep or ripgrep or silver searcher, those are all great tools you should have!

Septum is neighborhood based (context-based) search, so you can find contiguous groups of lines which contain specific things, but exclude other things. It's also interactive so you can add/remove filters as needed. This makes it useful for those cases where terms change based on their context so you can exclude terms related to the contexts you don't want to keep. It reads .septum/config which contains its normal commands to load directories and settings, so you can have different configs per project you're working on.