regexDescriptor = function regexDescriptor(regex) {
            return regex.exec.bind(regex);
       }
Export a regular expression as a simple function by exposing just 
the Regex#exec. This allows regex tests to be used under the same 
interface as differently implemented tests, or for a user of the
tests to not concern themselves with their implementation as regular
expressions.

This could also be expressed point-free as:
  Function.prototype.bind.bind(RegExp.prototype.exec),
  
But that's far too confusing! (and not even smaller once minified 
and gzipped)