.NET 正则表达式 类型 Match Group Capture

这几个概念比较细致，见如下程序演示。

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

 namespace RegExFindArgs
{
    class Program
    {
        static void Main(string[] args)
        {
            Experiment();
        }

        public static void Experiment()
        {
            Regex regex = new Regex(@"(([A-Z])+(\d)+)", RegexOptions.Multiline | RegexOptions.Singleline | RegexOptions.CultureInvariant | RegexOptions.Compiled);
            String test = "ABC12345";
            MatchCollection mc = regex.Matches(test);
            Console.WriteLine("MatchCollection count:{0}", mc.Count);
            Console.WriteLine("----------------");

            for (Int32 mc_i = 0; mc_i < mc.Count; mc_i++)
            {
                Console.WriteLine("Match[{0}].Value:[{1}]", mc_i, mc[mc_i].Value);
                GroupCollection gc = mc[mc_i].Groups;
                Console.WriteLine("  There're {0} groups in this match", gc.Count);
                
                for (Int32 gc_i = 0; gc_i < gc.Count; gc_i++)
                {
                    Console.WriteLine("  Group[{0}].Value:[{1}]", gc_i, gc[gc_i].Value);

                    CaptureCollection cc = gc[gc_i].Captures;
                    Console.WriteLine("    There're {0} captures in this group", cc.Count);
                    for (Int32 cc_i = 0; cc_i < cc.Count; cc_i++)
                    {
                        Console.WriteLine("    Capture[{0}].Value:[{1}]", cc_i, cc[cc_i].Value);
                    }
                }
            }            
        }
    }
}
 

输出：

MatchCollection count:1
----------------
Match[0].Value:[ABC12345]
  There're 4 groups in this match
  Group[0].Value:[ABC12345]
    There're 1 captures in this group
    Capture[0].Value:[ABC12345]
  Group[1].Value:[ABC12345]
    There're 1 captures in this group
    Capture[0].Value:[ABC12345]
  Group[2].Value:[C]
    There're 3 captures in this group
    Capture[0].Value:[A]
    Capture[1].Value:[B]
    Capture[2].Value:[C]
  Group[3].Value:[5]
    There're 5 captures in this group
    Capture[0].Value:[1]
    Capture[1].Value:[2]
    Capture[2].Value:[3]
    Capture[3].Value:[4]
    Capture[4].Value:[5]

相关参考：http://www.cn-cuckoo.com/2007/07/26/math-group-and-capture-42.html