using System;  
using System.Text.RegularExpressions;   
namespace Magci.Test.Strings  
{      
    public class TestRegular      
    {          
        public static void WriteMatches(string str, MatchCollection matches)          
        {              
            Console.WriteLine("\nString is : " + str);              
            Console.WriteLine("No. of matches : " + matches.Count);              
            foreach (Match nextMatch in matches)              
            {                  
                //取出匹配字符串和最多10个外围字符                  
                int Index = nextMatch.Index;                  
                string result = nextMatch.ToString();                  
                int charsBefore = (Index < 5) ? Index : 5;                  
                int fromEnd = str.Length - Index - result.Length;                  
                int charsAfter = (fromEnd < 5) ? fromEnd : 5;                  
                int charsToDisplay = charsBefore + result.Length + charsAfter;                   
                Console.WriteLine("Index: {0},\tString: {1},\t{2}", Index, result, str.Substring(Index - charsBefore, charsToDisplay));             
            }          
        }           
        
        public static void Main()          
        {              
            string Str = @"My name is Magci, for short mgc. I like c sharp!";               
            //查找“gc”              
            string Pattern = "gc";              
            MatchCollection Matches = Regex.Matches(Str, Pattern, RegexOptions.IgnoreCase | RegexOptions.ExplicitCapture);               
            WriteMatches(Str, Matches);                            
            //查找以“m”开头，“c”结尾的单词              
            Pattern = @"\bm\S*c\b";              
            Matches = Regex.Matches(Str, Pattern, RegexOptions.IgnoreCase | RegexOptions.ExplicitCapture);               
            WriteMatches(Str, Matches);          
        }      
    }  
}