C# 提取身份证号

思路：如果号码是18位的，并且符合生日规则，还有前面和后面都不是数字的这种才是身份证号，避免误采

            string idCard = "  135412198801245521af888888888888888888,110444199601012145";
            idCard = " " + idCard + " ";
            MatchCollection mcIdCard = Regex.Matches(idCard, @"(\D[1-9]\d{5}[12]\d{3}(0[1-9]|1[012])(0[1-9]|[12][0-9]|3[01])\d{3}[0-9xX]\D)");
            foreach (Match match in mcIdCard)
            {
                var result = match.Value;
                result = GetRealIdCardNumber(result);
                Console.WriteLine(result);
            }
            Console.ReadLine();

 

        public static string GetRealIdCardNumber(string input)
        {
            var result = string.Empty;
            if (!string.IsNullOrWhiteSpace(input))
            {
                input = input.Replace(" ", "");
                List<string> list = new List<string>();
                Regex regex = new Regex(@"([1-9]\d{5}[12]\d{3}(0[1-9]|1[012])(0[1-9]|[12][0-9]|3[01])\d{3}[0-9xX])");
                MatchCollection collection = regex.Matches(input);

                if (collection.Count > 0 && collection[0].Groups.Count > 0)
                {
                    result = collection[0].Groups[0].Value;
                }
            }
            return result;
        }