获取正则表达式匹配的字符串

public static string getRegexString(string LengthString,string strRegex, string param)




...{


string s = "";


Regex reg = new Regex(strRegex);


Match match = reg.Match(LengthString);


if (match.Success)




...{


if (param == "")




...{


s = match.ToString();


}


else




...{


s = match.Groups[param].Value.ToString().Trim();


}


}


return s;


}