Using REGEX quantifiers with the find command

For example, in the following example I am lokking in the /movoes/ directory for all movies with a quality suffix, (e.g. /movies/a/Avengers - Endgame (2019) [HC].mp4)

find /movies/ -type f -regextype grep -regex '.*\[.\{1,4\}\].*'

Notes

  • The single quotes ' around the entire REGEX pattern are required!
  • The initial .* and final .* are required!. This is because the pattern is applied to the entire line, or in this case, the full path, returned by find
  • The square brackets [ and ] and the curly brackets { and } are all escaped with a single \ to ensure they are passed to REGEX from bash.
  • The --regextype grep ensures the REGEX quantifier syntax is supported. The default GNU find does not support the \{from,to\} syntax. --regextype sed among other types, will also work.

Sources:

StackExchange: find command with regex quantifiers