in reply to cool regular expression needed for matching in columns

Many ways... one is
while(<DATA>) { chomp; print "$_ => @_\n" if @_= /(abc|xyz)(?=(?:...)*$)/g; } __DATA__ abcmmmnnn mmmxyznnn mabcmxyzm xyzfooabc __END__ abcmmmnnn => abc mmmxyznnn => xyz xyzfooabc => xyz abc

--shmem

_($_=" "x(1<<5)."?\n".q·/)Oo.  G°\        /
                              /\_¯/(q    /
----------------------------  \__(m.====·.(_("always off the crowd"))."·
");sub _{s./.($e="'Itrs `mnsgdq Gdbj O`qkdq")=~y/"-y/#-z/;$e.e && print}