git-grep -PでPCRE(Perl Compatible Regular Expressions)を使おうと思ったら下記のようなエラーが発生。
fatal: cannot use Perl-compatible regexes when not compiled with USE_LIBPCRE
-with-pcreオプションををつけてgitを再インストールすればOK
brew unlink git
brew install git --with-pcre
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