Grep "Pattern 2" only in files containing "Pattern 1"

Question

I am trying to search for a "pattern 1" only in files that contain another string "pattern 2"

E.g.

A.txt Pattern 1 ... Pattern 2

B.txt Pattern Z ... Pattern 2

I intend to filter out files that match Pattern 1 in this case A.txt and then search occurrences of Pattern 2 only in A.txt.

I am trying below but doesn't work.

grep -rl "Pattern 1" . -exec grep -or "Pattern 2" +

Note: Some file paths include spaces.

Answer 1

You can pipe to xargs:

grep -rlZ "Pattern 1" | xargs -0 grep -l "Pattern 2"

or use find and grep -q + grep -l:

find . -type f \
  -exec grep -q "Pattern 1" {} \; \
  -exec grep -l "Pattern 2" {} +

The xargs option is probably more performant, as it will call grep on multiple files at once, while the find will call grep for each file.