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: [email protected]".Extract("*?@?*.?*");

            foreach (var str in listResult)

            {

                Console.WriteLine(str);

            }

            // result is an array containing each part of the pattern: {"toto", "domain", "com"}

            Console.ReadKey();

        }

    }

}