I don't like Regex...

refer to：http://www.codeproject.com/Articles/368258/I-dont-like-Regex

字符串扩展方法类：

using System;
using System.Collections.Generic;
using System.Text.RegularExpressions;

namespace RegexExtract
{
    static class StringExtract
    {

        public static bool Like(this string item, string searchPattern)
        {
            return GetRegex("^" + searchPattern).IsMatch(item);
        }

        public static string Search(this string item, string searchPattern)
        {
            var match = GetRegex(searchPattern).Match(item);
            if (match.Success)
            {
                return item.Substring(match.Index, match.Length);
            }
            return null;
        }

        public static List<string> Extract(this string item, string searchPattern)
        {
            var result = item.Search(searchPattern);
            if (!string.IsNullOrWhiteSpace(result))
            {
                var splitted = searchPattern.Split(new[] { '?', '%', '*', '#' }, StringSplitOptions.RemoveEmptyEntries);
                var temp = result;
                var final = new List<string>();
                Array.ForEach(splitted, x =>
                {
                    var pos = temp.IndexOf(x, StringComparison.Ordinal);
                    if (pos > 0)
                    {
                        final.Add(temp.Substring(0, pos));
                        temp = temp.Substring(pos);
                    }
                    temp = temp.Substring(x.Length);
                });
                if (temp.Length > 0) final.Add(temp);
                return final;
            }
            return null;
        }


        // private method which accepts the simplified pattern and transform it into a valid .net regex pattern:
        // it escapes standard regex syntax reserved characters 
        // and transforms the simplified syntax into the native Regex one
        static Regex GetRegex(string searchPattern)
        {
            return new Regex(searchPattern
                    .Replace("\\", "\\\\")
                    .Replace(".", "\\.")
                    .Replace("{", "\\{")
                    .Replace("}", "\\}")
                    .Replace("[", "\\[")
                    .Replace("]", "\\]")
                    .Replace("+", "\\+")
                    .Replace("$", "\\$")
                    .Replace(" ", "\\s")
                    .Replace("#", "[0-9]")
                    .Replace("?", ".")
                    .Replace("*", "\\w*")
                    .Replace("%", ".*")
                    , RegexOptions.IgnoreCase);
        }
    }
}

　　测试用例：

using System;

namespace RegexExtract
{
    class Program
    {
        static void Main()
        {
            //example: a string is a guid  
            var result = "TA0E02391-A0DF-4772-B39A-C11F7D63C495".Like("?????????-????-????-????-????????????"); 
            Console.WriteLine(result);
            //example: a string starts with a guid
            result = "This is a guid TA0E02391-A0DF-4772-B39A-C11F7D63C495".Like("%?????????-????-????-????-????????????");
            Console.WriteLine(result);
            //example: a string ends with a guid
            result = "TA0E02391-A0DF-4772-B39A-C11F7D63C495 is a guid".Like("?????????-????-????-????-????????????%");
            Console.WriteLine(result);
            //example: a string contains a guid
            result = "this string TA0E02391-A0DF-4772-B39A-C11F7D63C495 contains a guid".Like("%?????????-????-????-????-????????????%");
            Console.WriteLine(result);

            //example: Search for a guid inside a text
            var strResult =
                "this string [TA0E02391-A0DF-4772-B39A-C11F7D63C495] contains a string matching".Search(
                    "[?????????-????-????-????-????????????]");
            Console.WriteLine(strResult); // output: [TA0E02391-A0DF-4772-B39A-C11F7D63C495]

            //example: retrieving the consituents of a guid inside a text
            var listResult =
                "this string [TA0E02391-A0DF-4772-B39A-C11F7D63C495] contains a string matching".Extract(
                    "[?????????-????-????-????-????????????]");
            foreach (var str in listResult)
            {
                Console.WriteLine(str);
            }
            // result is an array containing each part of the pattern: {"TA0E02391", "A0DF", "4772", "B39A", "C11F7D63C495"}

            //example: retrieving the consituents of an email inside a text
            listResult = "this string contains an email: toto@domain.com".Extract("*?@?*.?*");
            foreach (var str in listResult)
            {
                Console.WriteLine(str);
            }
            // result is an array containing each part of the pattern: {"toto", "domain", "com"}
            Console.ReadKey();
        }
    }
}