Perl != C++: please use # as comment introducer. // is the defined-or operator and very confusing in questions that deal with regular expressions.

I'd advice to never ever use // comment style anywhere at all. ever. It is allowed in C99, and in that not even every C-compiler that claims to be C99 will accept it. It will break every C89 compiler (maybe not all gcc versions, but still). // outside of C++ should die.