C#关于使用正则表达式解析字符串

C#关于使用正则表达式解析字符串：

string author = SniffwebCode(content, "<span id=\"endAuthor\">", "</span>").Trim();

public string SniffwebCode(string code, string wordsBegin, string wordsEnd)
{
string NewsTitle = "";
Regex regex1 = new Regex("" + wordsBegin + @"(?<title>[\s\S]+?)" + wordsEnd + "", 
RegexOptions.Compiled | RegexOptions.IgnoreCase);
for (Match match1 = regex1.Match(code); match1.Success; match1 = match1.NextMatch())
  {
            NewsTitle = match1.Groups["title"].ToString();
  }
 return NewsTitle;
}

C#正则替换字符串

class Program { 

static void Main(string[] args) 
{ 
string s = "<ConnectString>Data Source=asdf, Database=fees</ConnectString>"; 
Regex r = new Regex("(?<=<ConnectString>).*?(?=</ConnectString>)", RegexOptions.IgnoreCase); 
string result = r.Replace(s, "新字符串"); 
Console.WriteLine(result); 
Console.ReadKey(); 

} 

}

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