grep с регулярными выражениями, совместимыми с Perl (a grep with Perl-compatible regular expressions.)
OPTIONS COMPATIBILITY
Many of the short and long forms of pcregrep's options are the
same as in the GNU grep program. Any long option of the form
--xxx-regexp (GNU terminology) is also available as --xxx-regex
(PCRE terminology). However, the --file-list, --file-offsets,
--include-dir, --line-offsets, --locale, --match-limit, -M,
--multiline, -N, --newline, --om-separator, --recursion-limit,
-u, and --utf-8 options are specific to pcregrep, as is the use
of the --only-matching option with a capturing parentheses
number.
Although most of the common options work the same way, a few are
different in pcregrep. For example, the --include option's
argument is a glob for GNU grep, but a regular expression for
pcregrep. If both the -c and -l options are given, GNU grep lists
only file names, without counts, but pcregrep gives the counts.
