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$ perl -e'm!\/?(.*)\/([^/]+\/?)!' $ perl -e'm/\/?(.*)\/([^/]+\/?)/' Unmatched [ before HERE mark in regex m//?(.*)/([ << HERE ^/ at -e lin +e 1.
Summary of my perl5 (revision 5.0 version 6 subversion 1) configuratio +n: Platform: ... /usr/lib/perl5/site_perl /usr/lib/perl5/site_perl .