removed buggy regexp option from instrument filter

Author: bjouhier

lib/coverage.js

@@ -59,7 +59,6 @@ exports.instrument = function(options) {
             files = Array.isArray(files) ? files : [files];
             return files.some(function(f) {
                 if (typeof f === 'string') return file.indexOf(f) === 0;
-                else if (f instanceof RegExp) return f.test(file);
                 else throw new Error("invalid entry in options.coverage.files: " + typeof f);
             });
         } else {