bug#18455: grep 2.20 perl-regexp: invalid UTF-8 byte sequence in input

[Mario Grgic]

This happens with GNU grep version 2.20 and PCRE 8.35 on Mac OS X. The 
following command reproduce the problem: 

$ printf 'j\x82\nj\n' | grep -P j
invalid UTF-8 byte sequence in input

But I usually encounter this when recursively searching through files and 
encountering a binary file which contains invalid UTF-8 sequence.  If binary 
file with invalid UTF-8 sequence is encountered first (without any other 
matches), grep will abort the entire recursive search and not even mention 
which file caused the error. This is somewhat confusing when you first 
encounter it. 

By the way, this works in GNU grep 2.18 without any errors (you get messages 
like binary file x matches), and with PCRE 8.33 or 8.35 (I have not tried any 
other combinations).