Remember, you said $path was: 'hiec/by/mlor/kkss23/dndd@@mani/css.cpp/0'.

Try something like this:

if($path =~ /(\d+)$/ == 0) {} else {}
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Note that what you used never captured the resulting match (that is, it was used in void context and had not side effects). Using the parentheses like I do, it sets the $1 variable (see perlre) -- note, too, that it also returns the value which I check, so you can say something like  $my_value = ...regex_here...