/// <summary>
        /// dictionary that maps 2 Alpha Country with valid Postal Code format in regex;
        /// </summary>
        private static readonly Dictionary<string, string> _PostalCodesRegex = new Dictionary<string, string>()
        {
            {"GB", @"GIR[ ]?0AA|((AB|AL|B|BA|BB|BD|BH|BL|BN|BR|BS|BT|CA|CB|CF|CH|CM|CO|CR|CT|CV|CW|DA|DD|DE|DG|DH|DL|DN|DT|DY|E|EC|EH|EN|EX|FK|FY|G|GL|GY|GU|HA|HD|HG|HP|HR|HS|HU|HX|IG|IM|IP|IV|JE|KA|KT|KW|KY|L|LA|LD|LE|LL|LN|LS|LU|M|ME|MK|ML|N|NE|NG|NN|NP|NR|NW|OL|OX|PA|PE|PH|PL|PO|PR|RG|RH|RM|S|SA|SE|SG|SK|SL|SM|SN|SO|SP|SR|SS|ST|SW|SY|TA|TD|TF|TN|TQ|TR|TS|TW|UB|W|WA|WC|WD|WF|WN|WR|WS|WV|YO|ZE)(\d[\dA-Z]?[ ]?\d[ABD-HJLN-UW-Z]{2}))|BFPO[ ]?\d{1,4}"},
            {"JE", @"JE\d[\dA-Z]?[ ]?\d[ABD-HJLN-UW-Z]{2}"},
            {"GG", @"GY\d[\dA-Z]?[ ]?\d[ABD-HJLN-UW-Z]{2}"},
            {"IM", @"IM\d[\dA-Z]?[ ]?\d[ABD-HJLN-UW-Z]{2}"},
            {"US", @"\d{5}([ \-]\d{4})?"},
            {"CA", @"[ABCEGHJKLMNPRSTVXY]\d[ABCEGHJ-NPRSTV-Z][ ]?\d[ABCEGHJ-NPRSTV-Z]\d"},
            {"DE", @"\d{5}"},
            {"JP", @"\d{3}-\d{4}"},
            {"FR", @"\d{2}[ ]?\d{3}"},
            {"AU", @"\d{4}"},
            {"IT", @"\d{5}"},
            {"CH", @"\d{4}"},
            {"AT", @"\d{4}"},
            {"ES", @"\d{5}"},
            {"NL", @"\d{4}[ ]?[A-Z]{2}"},
            {"BE", @"\d{4}"},
            {"DK", @"\d{4}"},
            {"SE", @"\d{3}[ ]?\d{2}"},
            {"NO", @"\d{4}"},
            {"BR", @"\d{5}[\-]?\d{3}"},
            {"PT", @"\d{4}([\-]\d{3})?"},
            {"FI", @"\d{5}"},
            {"AX", @"22\d{3}"},
            {"KR", @"\d{3}[\-]\d{3}"},
            {"CN", @"\d{6}"},
            {"TW", @"\d{3}(\d{2})?"},
            {"SG", @"\d{6}"},
            {"DZ", @"\d{5}"},
            {"AD", @"AD\d{3}"},
            {"AR", @"([A-HJ-NP-Z])?\d{4}([A-Z]{3})?"},
            {"AM", @"(37)?\d{4}"},
            {"AZ", @"\d{4}"},
            {"BH", @"((1[0-2]|[2-9])\d{2})?"},
            {"BD", @"\d{4}"},
            {"BB", @"(BB\d{5})?"},
            {"BY", @"\d{6}"},
            {"BM", @"[A-Z]{2}[ ]?[A-Z0-9]{2}"},
            {"BA", @"\d{5}"},
            {"IO", @"BBND 1ZZ"},
            {"BN", @"[A-Z]{2}[ ]?\d{4}"},
            {"BG", @"\d{4}"},
            {"KH", @"\d{5}"},
            {"CV", @"\d{4}"},
            {"CL", @"\d{7}"},
            {"CR", @"\d{4,5}|\d{3}-\d{4}"},
            {"HR", @"\d{5}"},
            {"CY", @"\d{4}"},
            {"CZ", @"\d{3}[ ]?\d{2}"},
            {"DO", @"\d{5}"},
            {"EC", @"([A-Z]\d{4}[A-Z]|(?:[A-Z]{2})?\d{6})?"},
            {"EG", @"\d{5}"},
            {"EE", @"\d{5}"},
            {"FO", @"\d{3}"},
            {"GE", @"\d{4}"},
            {"GR", @"\d{3}[ ]\d{2}"},
            {"GL", @"39\d{2}"},
            {"GT", @"\d{5}"},
            {"HT", @"\d{4}"},
            {"HN", @"(?:\d{5})?"},
            {"HU", @"\d{4}"},
            {"IS", @"\d{3}"},
            {"IN", @"\d{6}"},
            {"ID", @"\d{5}"},
            {"IE", @"[A-Za-z][a-zA-Z\d]{2}\s?[A-Za-z\d]{4}"},
            {"IL", @"\d{5}"},
            {"JO", @"\d{5}"},
            {"KZ", @"\d{6}"},
            {"KE", @"\d{5}"},
            {"KW", @"\d{5}"},
            {"LA", @"\d{5}"},
            {"LV", @"\d{4}"},
            {"LB", @"(\d{4}([ ]?\d{4})?)?"},
            {"LI", @"(948[5-9])|(949[0-7])"},
            {"LT", @"\d{5}"},
            {"LU", @"\d{4}"},
            {"MK", @"\d{4}"},
            {"MY", @"\d{5}"},
            {"MV", @"\d{5}"},
            {"MT", @"[A-Z]{3}[ ]?\d{2,4}"},
            {"MU", @"(\d{3}[A-Z]{2}\d{3})?"},
            {"MX", @"\d{5}"},
            {"MD", @"\d{4}"},
            {"MC", @"980\d{2}"},
            {"MA", @"\d{5}"},
            {"NP", @"\d{5}"},
            {"NZ", @"\d{4}"},
            {"NI", @"((\d{4}-)?\d{3}-\d{3}(-\d{1})?)?"},
            {"NG", @"(\d{6})?"},
            {"OM", @"(PC )?\d{3}"},
            {"PK", @"\d{5}"},
            {"PY", @"\d{4}"},
            {"PH", @"\d{4}"},
            {"PL", @"\d{2}-\d{3}"},
            {"PR", @"00[679]\d{2}([ \-]\d{4})?"},
            {"RO", @"\d{6}"},
            {"RU", @"\d{6}"},
            {"SM", @"4789\d"},
            {"SA", @"\d{5}"},
            {"SN", @"\d{5}"},
            {"SK", @"\d{3}[ ]?\d{2}"},
            {"SI", @"\d{4}"},
            {"ZA", @"\d{4}"},
            {"LK", @"\d{5}"},
            {"TJ", @"\d{6}"},
            {"TH", @"\d{5}"},
            {"TN", @"\d{4}"},
            {"TR", @"\d{5}"},
            {"TM", @"\d{6}"},
            {"UA", @"\d{5}"},
            {"UY", @"\d{5}"},
            {"UZ", @"\d{6}"},
            {"VA", @"00120"},
            {"VE", @"\d{4}"},
            {"ZM", @"\d{5}"},
            {"AS", @"96799"},
            {"CC", @"6799"},
            {"CK", @"\d{4}"},
            {"RS", @"\d{6}"},
            {"ME", @"8\d{4}"},
            {"CS", @"\d{5}"},
            {"YU", @"\d{5}"},
            {"CX", @"6798"},
            {"ET", @"\d{4}"},
            {"FK", @"FIQQ 1ZZ"},
            {"NF", @"2899"},
            {"FM", @"(9694[1-4])([ \-]\d{4})?"},
            {"GF", @"9[78]3\d{2}"},
            {"GN", @"\d{3}"},
            {"GP", @"9[78][01]\d{2}"},
            {"GS", @"SIQQ 1ZZ"},
            {"GU", @"969[123]\d([ \-]\d{4})?"},
            {"GW", @"\d{4}"},
            {"HM", @"\d{4}"},
            {"IQ", @"\d{5}"},
            {"KG", @"\d{6}"},
            {"LR", @"\d{4}"},
            {"LS", @"\d{3}"},
            {"MG", @"\d{3}"},
            {"MH", @"969[67]\d([ \-]\d{4})?"},
            {"MN", @"\d{6}"},
            {"MP", @"9695[012]([ \-]\d{4})?"},
            {"MQ", @"9[78]2\d{2}"},
            {"NC", @"988\d{2}"},
            {"NE", @"\d{4}"},
            {"VI", @"008(([0-4]\d)|(5[01]))([ \-]\d{4})?"},
            {"PF", @"987\d{2}"},
            {"PG", @"\d{3}"},
            {"PM", @"9[78]5\d{2}"},
            {"PN", @"PCRN 1ZZ"},
            {"PW", @"96940"},
            {"RE", @"9[78]4\d{2}"},
            {"SH", @"(ASCN|STHL) 1ZZ"},
            {"SJ", @"\d{4}"},
            {"SO", @"\d{5}"},
            {"SZ", @"[HLMS]\d{3}"},
            {"TC", @"TKCA 1ZZ"},
            {"WF", @"986\d{2}"},
            {"XK", @"\d{5}"},
            {"YT", @"976\d{2}"},
        };