You forgot to backwhack the dots in your patterns, and to anchor them at the end with a '$'. You're getting everything that contains 'h' or a 'c' (except as the first character).

Incidentally, you'll need to double the backwhack and backwhack the '$' unless you use // for the pattern (which is recommended). So you should spell it: if (/\.c$/ || /\.h$/) { push ... }

BTW, "$File::Find::dir/$_" is already available as $File::Find::name.