Update of bug #14990 (project grep):
Severity: 3 - Normal => 2 - Minor
Open/Closed: Open => Closed
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Follow-up Comment #2:
This specific message is the result of your grep having been built with
"configure --disable-perl-regexp". Did you have libpcre installed on your
Gentoo system when you build grep? There is a "pcre? ( dev-libs/libpcre )"
and a "$(use_enable pcre perl-regexp)" in Gentoo's grep-2.5.1-r8.ebuild.
Support for "grep -P" is experimental and partial. As part of a proposed
rework I am currently doing on the documentation, I have added a few days
ago: "Interpret the pattern as a Perl regular expression. This is highly
experimental and @samp{grep@ -P} may warn of unimplemented features."
"grep -P" is not broken, it's a work in progress. Since there are more
fundamental bugs in grep that need to be addressed, it's also not the highest
priority.
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