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string pattern = "(mr|dr) ([A-Z])[a-z]*"; string str = "mr Jhons$,dr Tom$";
Regex regex = new Regex(pattern); var ouputStr = regex.Replace(str, "Mr X");
Console.WriteLine(ouputStr); Console.WriteLine(); ouputStr = regex.Replace(str,
"$1 X");//$group，使用group指定的组号 Console.WriteLine(ouputStr); Console.WriteLine();
ouputStr= regex.Replace(str, "$2 X");//$group，使用group指定的组号 Console.WriteLine(
ouputStr); Console.WriteLine(); ouputStr = regex.Replace(str, "$+ X");
//把找到的匹配使用最后一个组替换 Console.WriteLine(ouputStr); Console.WriteLine(); pattern =
"(?<groupName>mr|dr) ([A-Z])[a-z]*"; regex = new Regex(pattern); ouputStr =
regex.Replace(str, "${groupName} X");//把找到的所有匹配使用groupName替换 Console.WriteLine(
ouputStr); Console.WriteLine(); pattern = "mr [A-Z][a-z]*"; str = "mr Jhons!";
regex= new Regex(pattern); ouputStr = regex.Replace(str, "$");//把找到的匹配使用$替换
Console.WriteLine(ouputStr); Console.WriteLine(); pattern = "mr [A-Z][a-z]*";
str= "@!mr Jhons"; regex = new Regex(pattern); ouputStr = regex.Replace(str,
"$`");//把找到的匹配使用匹配前的文本去替换，在这里匹配前的文本是"@!"。 Console.WriteLine(ouputStr); Console.
WriteLine(); pattern = "mr [A-Z][a-z]*"; str = "%mr Jhons@!"; regex = new Regex(
pattern); ouputStr = regex.Replace(str, "$'");
//把找到的匹配使用匹配后的文本去替换，在这里匹配后的文本是"@!"。 Console.WriteLine(ouputStr); Console.
WriteLine(); pattern = "mr [A-Z][a-z]*"; str = "%mr Jhons@!"; regex = new Regex(
pattern); ouputStr = regex.Replace(str, "$_");//把找到的匹配使用整个的字符串，也就是str的值来替换
Console.WriteLine(ouputStr);