ngBlur - to work with function passed as argument only

Blur.js

var BlurDirective = function () {

    return {
        restrict: 'A',
        link: function (scope, elm, attrs) {

            elm.bind('blur', function () {
               console.log(attrs);
                var blurArgs = attrs.blur,
                    functionName = blurArgs.match(/([^\(]*)/),
                    functionArgsString = blurArgs.match(/\(([^\)]*)\)/);

                if (functionName.length && functionArgsString.length) {
                        var args = functionArgsString[1].indexOf(',') !== -1 ? functionArgsString.split(',') : [functionArgsString[1]];
                    scope[functionName[1]].apply(scope, args);
                    scope.$apply();
                }
            });
        }
    };
};