Csharp: Searching Within a String

 1  /// <summary>
 2     /// 20130118
 3     ///  
 4     ///    
 5     ///  
 6     /// </summary>
 7     public class StringSearchClass
 8     {
 9         /// <summary>
10         ///  
11         /// StringIndexOf("1,2,3,4,5,6", "1,8");
12         /// </summary>
13         /// <param name="str1"> </param>
14         /// <param name="judgestr">  </param>
15         /// <returns> </returns>
16         public static bool StringIndexOf(string str1, string searchstr)
17         {
18             bool isExist = true;
19             str1 = "," + str1 + ",";
20             string[] strs = searchstr.Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries);
21             foreach (string strtemp in strs)
22             {
23                 if (str1.IndexOf(',' + strtemp + ',') == -1)
24                 {
25                     isExist = false;
26                     break;
27                 }
28             }
29             return isExist;
30         }
31         /// <summary>
32         ///   
33         ///  
34         /// </summary>
35         /// <param name="str1"> </param>
36         /// <param name="judgestr">  </param>
37         /// <returns></returns>
38         public static bool StringContains(string str1, string searchstr)
39         {
40             bool isExist = true;
41             str1 = "," + str1 + ",";
42             string[] strs = searchstr.Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries);
43             foreach (string strtemp in strs)
44             {
45                 if (!str1.Contains(',' + strtemp + ','))
46                 {
47                     isExist = false;
48                     break;
49                 }
50             }
51             return isExist;
52         }
53         /// <summary>
54         ///  
55         ///  
56         /// </summary>
57         /// <param name="str1"> </param>
58         /// <param name="judgestr">  </param>
59         /// <returns></returns>
60         public static bool StringRegex(string str1, string searchstr)
61         {
62             bool isExist = true;
63             str1 = "," + str1 + ",";
64             string[] strs = searchstr.Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries);
65             foreach (string strtemp in strs)
66             {
67                 if (!Regex.Match(str1, strtemp, RegexOptions.IgnoreCase).Success)
68                 {
69                     isExist = false;
70                 }
71             }
72             return isExist;
73         }
74     }

1 // 
2             Stopwatch sw = new Stopwatch();
3             
4             sw.Start();
5            // bool s = StringIndexOf("1,2,3,4,5,6", "1,6");//True, ：00:00:00.0003557
6            // bool s = StringContains("1,2,3,4,5,6", "1,6");//True, ：00:00:00.0003625
7             bool s = StringRegex("1,2,3,4,5,6", "1,6");//False, ：00:00:00.0286617 //True, ：00:00:00.0008295 //True, ：00:00:00.0008237
8            sw.Stop();
9            this.textBox1.Text=s.ToString()+", ："+sw.Elapsed.ToString();