pattern mask phone

$('input[type="tel"]').inputmask("phone", {
        onKeyValidation: function () {

            mask = $(this).inputmask("getmetadata")["mask"];
            pattern = "";

            // console.log(mask);

            console.log("length: ");
            console.log($(this).val().length);

            index = mask.indexOf("(");

            if (index > 0) {

                index2 = mask.indexOf(")");
                index3 = index2 - index - 1;

                // console.log(index3);

                mask = mask.substr(index2+1);

                // console.log(mask);

                arr = mask.split('-');
                // console.log(arr);

                index4 = arr[0].length;
                index5 = arr[1].length;
                index6  = arr[2].length;

                index = index-1;
                // console.log(index);

                index = 1;
                index2 = 3;


                pattern = '^[+]\d{'+index+'}\\';
                pattern = pattern + '(\\d{'+index2+'}\\)';

                arr.forEach(function(entry) {

                    pattern = pattern + '-\\d{'+ entry.length +'}';

                    console.log(entry);

                });

                pattern = pattern + '$';

                pattern = '^[+]\\d{1}\\(\\d{3}\\)\\d{3}-\\d{2}-\\d{2}$';

                console.log(pattern);

                // pattern = '^[+]\d{1}\(\d{3}\)\d{3}-\d{2}-\d{2}$';

                // pattern = '^[+]\\d{'+ index +'}\\(\\d{'+ index3 +'}\\)\\d{'+ index4 +'}(-\\d{'+ index5 +'}){'+ index6 +'}$';

            } else {

                // console.log(mask);

                index = mask.indexOf("-");
                index2 = mask.indexOf("-");
                index3 = index2 - index - 1;

                mask = mask.substr(index2+1);

                console.log(mask);

                index = mask.indexOf("-");

                arr = mask.split('-');
                // console.log(arr.length);

                // index4 = arr[0].length;
                // index5 = arr[1].length;
                // index6  = arr[2].length;

                // index = index-1;

                // console.log(index);

                index = 3;

                pattern = '^[+]\\d{'+ index +'}';

                arr.forEach(function(entry) {

                    pattern = pattern + '-\\d{'+ entry.length +'}';

                    console.log(entry);

                });

                pattern = pattern + '$';


            }


            // $(this).attr({
            //     'pattern': pattern
            // });

        }
    });