You may want to use file globbing instead. This is one I just used yesterday afternoon. I needed to search for a string in every .js or .jsx file in my project, but didn't want to include specs in the search.
rg 'MySearchString' **/*.js[x]#~*spec*
Voila. Note that this is for zsh, and you need to set the EXTENDED_GLOB option. But once you do you'll find yourself rarely needing to reach for `find`.