大家心目中正则的最厉害的一招展示

using System;

using System.Text.RegularExpressions;



class Program

{

	static void Main(string[] args)

	{

		string str = "<You're angle & evil>";

		string pattern = "'|&|<|>";



		Regex regex = new Regex(pattern);



		Program prog = new Program();

		MatchEvaluator evaluator = new MatchEvaluator(prog.ConvertToXML);

		Console.WriteLine(regex.Replace(str, evaluator));

		Console.Read();

	}



	//把正则表达式的匹配到的字符转换成xml能正常识别的标识

	public string ConvertToXML(Match m)

	{

               //string s0=m.Groups[0].Value;

	       //string s1=m.Groups[1].Value;

	       //string s2=m.Groups[2].Value;

		switch (m.Value)

		{

			case "'":

				return "&apos";

			case "&":

				return "&";

			case "<":

				return "<";

			case ">":

				return ">";

			default:

				return "";                    

		}

	}

}