using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            string html = @"...  
 <div class=""cntent commin"">
     <div class=""confl"">
       <div class=""newTit"">
         <h2>文章标题</h2>
       </div>
       <div class=""readCount"">
         <h4><span>时间:2014-9-2 16:18:15</span>
 ...
 <div class=""xiangguan"" style=""margin-right:0px;"">
         <h2>相关新闻</h2>
         <ul>
 ...";
            Regex rexXxbt = new Regex(@"(?is)(?<=\<div\sclass\=\""newTit\""\>\r\n\s+\<h2\>).*?(?=\<\/h2\>\r\n\s+\<\/div\>)");
            Console.WriteLine(rexXxbt.Match(html).Value);
        }
    }
}