Regex 小试

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对于正则表达式的几具尝试

 static void Main(string[] args)        {            string input = "This is,text with,far%too much whitespace.";            string pattern = ",";            string replacement = "&";            Regex rgx = new Regex(pattern);            string result = rgx.Replace(input, replacement);            Console.WriteLine("Original String: {0}", input);            Console.WriteLine("Replacement String: {0}", result);            Console.Read();        }

输出结果：

Original String : This is,text with,far%too much whitespace.
Replacement String: This is&text with&far%too much whitespace.

2).

string pattern = ",|%";

输出结果：

Original String : This is,text with,far%too much whitespace.
Replacement String: This is&text with&far&too much whitespace.

3).

string pattern = "[,%]";

输出结果：

Original String : This is,text with,far%too much whitespace.
Replacement String: This is&text with&far&too much whitespace.

4).

string pattern = ",%";

Original String : This is,text with,far%too much whitespace.
Replacement String: This is,text with,far%too much whitespace.

string input = "This is,text with,far%too much,% whitespace.";string pattern = "(,%)";

输出结果：

Original String : This is,text with,far%too much,% whitespace.
Replacement String: This is,text with,far%too much& whitespace.

总结下：

[　]：选择，　（）：整体，　｜：或