求一正则的写法

Question

想从<a onmouseup="1231" href="www.a.com" target="_self">张三</a>中取出www.a.com

Answer 1

            string a = @"<a onmouseup=""1231"" href=""www.a.com"" target=""_self"">张三</a>";
            string tempStr = File.ReadAllText(@"C:\1.txt", Encoding.GetEncoding("GB2312"));
            Regex re = new Regex(@"<a\s*onmouseup=""1231""\s*href=""(?<href>.*)""\s*target=""_self""\s*>(.*)</a>");
            string sr = re.Match(a).Groups["href"].Value;//www.a.com

Answer 2

这个onmouseup="1231" 不是唯一的，但是我只想匹配出<a>中含有onmouseup这个属性的herf值
<a onmouseup="1" href="www.a.com" target="_self">张三</a>中取出www.a.com
<a onmouseup="2" href="www.b.com" target="_self">李四</a>中取出www.b.com

Answer 3

把正则改成<a\s*onmouseup="(.*)"\s*href="(?<href>.*)"\s*target="_self"\s*>(.*)</a>            string a = @"<a onmouseup=""1231"" href=""www.a.com"" target=""_self"">张三</a>";
            Regex re = new Regex(@"<a\s*onmouseup="(.*)"\s*href="(?<href>.*)"\s*target="_self"\s*>(.*)</a>");
            string sr = re.Match(a).Groups["href"].Value;//www.a.com

Answer 4

改一下，上面那个有错            string a = @"<a onmouseup=""1231"" href=""www.a.com"" target=""_self"">张三</a>";       
            Regex re = new Regex(@"<a\s*onmouseup=""(.*)""\s*href=""(?<href>.*)""\s*target=""_self""\s*>(.*)</a>");         
            string sr = re.Match(a).Groups["href"].Value;

Answer 5

Regex re = new Regex(@"(?<=<a\s*onmouseup=""[^""]+""\s*href="")[^""]+(?="")", RegexOptions.None);
MatchCollection mc = re.Matches("你要提取的字符串");
foreach (Match ma in mc)
{
  //ma.Value就是你要的值
}

Answer 6

如果要匹配多条，用以下代码            Regex re = new Regex(@"<a\s*onmouseup=""([^""]*)""\s*href=""(?<href>.*)""\s*target=""[^""]""\s*>(.*)</a>");
            List<string> lists = new List<string>();
            MatchCollection sr = re.Matches(a);            foreach (Match me in sr)
            {
                lists.Add(me.Value);//结果在lists
            }