Add regex patterns for OSX files
improve regex
Remove blanket pending test for exe_spec

SeeRM #8436
SeeRM #8668

The fix for #8668 is more surgical than the previous fix for #8436, and
may prove to be more useful
Land #2627, fix rspec tests for OSX folks

It is extremely bad to be failing every time, since this tends to cause
people to not trust rspec at all.