/usr/share/perl5/Regexp/ is in libregexp-common-perl 2013031301-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/perl5/Regexp/Common/
/usr/share/perl5/Regexp/Common.pm
/usr/share/perl5/Regexp/Common/CC.pm
/usr/share/perl5/Regexp/Common/SEN.pm
/usr/share/perl5/Regexp/Common/URI/
/usr/share/perl5/Regexp/Common/URI.pm
/usr/share/perl5/Regexp/Common/URI/RFC1035.pm
/usr/share/perl5/Regexp/Common/URI/RFC1738.pm
/usr/share/perl5/Regexp/Common/URI/RFC1808.pm
/usr/share/perl5/Regexp/Common/URI/RFC2384.pm
/usr/share/perl5/Regexp/Common/URI/RFC2396.pm
/usr/share/perl5/Regexp/Common/URI/RFC2806.pm
/usr/share/perl5/Regexp/Common/URI/fax.pm
/usr/share/perl5/Regexp/Common/URI/file.pm
/usr/share/perl5/Regexp/Common/URI/ftp.pm
/usr/share/perl5/Regexp/Common/URI/gopher.pm
/usr/share/perl5/Regexp/Common/URI/http.pm
/usr/share/perl5/Regexp/Common/URI/news.pm
/usr/share/perl5/Regexp/Common/URI/pop.pm
/usr/share/perl5/Regexp/Common/URI/prospero.pm
/usr/share/perl5/Regexp/Common/URI/tel.pm
/usr/share/perl5/Regexp/Common/URI/telnet.pm
/usr/share/perl5/Regexp/Common/URI/tv.pm
/usr/share/perl5/Regexp/Common/URI/wais.pm
/usr/share/perl5/Regexp/Common/_support.pm
/usr/share/perl5/Regexp/Common/balanced.pm
/usr/share/perl5/Regexp/Common/comment.pm
/usr/share/perl5/Regexp/Common/delimited.pm
/usr/share/perl5/Regexp/Common/lingua.pm
/usr/share/perl5/Regexp/Common/list.pm
/usr/share/perl5/Regexp/Common/net.pm
/usr/share/perl5/Regexp/Common/number.pm
/usr/share/perl5/Regexp/Common/profanity.pm
/usr/share/perl5/Regexp/Common/whitespace.pm
/usr/share/perl5/Regexp/Common/zip.pm