It gets rid of the "m" vs "s" confusion by simply not using them!!

/pattern/ is equivalent to m/pattern/. | Nope, pritesh_ugrankar is referring to the /m and /s modifiers! But the following are still a good read. :) See perlre, perlretut (highly recommended!) and perlreref for regex info; also perlop for the m// and s/// (and tr///) operators.