正则表达式的使用

/*
正则表达式的使用
*/
using System.Text.RegularExpressions;

namespace Frank
{
	public class Test
    {
		//程序入口
        public static void Main(string[] args)
        {
			const string myText = "abcdeafsgabcadefgaaabcdefagaabcdefgaa"; 
			string pattern = "a";
			MatchCollection myMatches = Regex.Matches(myText,pattern,RegexOptions.IgnoreCase|RegexOptions.ExplicitCapture);
			foreach(Match item in myMatches)
			{
				System.Console.WriteLine(item.Index);//输出包含指定字符的位置索引
			}
			System.Console.WriteLine("---------------------------------");

			//查找以a开头以fg结尾，中是非空格的字符 的字符串
			pattern = @"\ba\S*aa\b";
			myMatches = Regex.Matches(myText,pattern,RegexOptions.IgnoreCase|RegexOptions.ExplicitCapture);
			System.Console.WriteLine(myMatches[0].Success+"----"+myMatches.Count);//是否匹配成功


        }
	}
}