I am trying to understand if it's worth the pain to replace the concise "grep -Po" option (that only GNU grep provides) and not the BSD grep (default on macOS), with something more verbose. The "\K" meta character and look-ahead "(?= ..)" operator that the "-P" switch provide are awesome along with the "-o" switch. So I am trying to understand: - Is installing GNU grep on macOS (though, very easily done using brew install) very rare? - What grep version do you use? - Are there any disadvantages for using the GNU grep binary on macOS? --- For fair votes, DO NOT VOTE if you do not use macOS. Thanks.