How can I exclude and include in the same grep?

Question

I'm writing a shell script that finds occurences a string ($string) of a certain filetype ($ext) in the current working directory ($cwd).

I also want to exclude all files that contain a certain string ("mbundle").

How would I amend what I have, to do that?

grep -nrwl $string --include=\*."$ext" "$cwd"

Sorry, I'm still pretty new to grep and regex/globbing patterns etc

Answer 1

If your grep supports -P (PCRE) option then you can use negative lookahead to avoid matching mbundle:

grep -P -nrwl "(?!.*?mbundle)$string" --include=\*."$ext" "$cwd"