Escape ( & ) from url before constructing regex

lib/types/path.js

@@ -77,7 +77,7 @@ function Path (api, path, definition, definitionFullyResolved, pathToDefinition)
   this.path = path;
   this.pathToDefinition = pathToDefinition;
   this.ptr = JsonRefs.pathToPtr(pathToDefinition);
-  this.regexp = pathToRegexp(basePathPrefix + path.replace(/\{/g, ':').replace(/\}/g, ''));
+  this.regexp = pathToRegexp(basePathPrefix + path.replace(/\(/g, '\\(').replace(/\)/g, '\\)').replace(/\{/g, ':').replace(/\}/g, ''));
 
   // Assign local properties from the Swagger definition properties
   _.assign(this, definitionFullyResolved);