string _str="<a style='color: #dffeaa' title=路虎1 href='http://www.baidu.com' target=_blank>路虎1</a>
<a style='color: #000' title=路虎2 href='http://www.baidu.com' target=_blank>路虎2</a>
<a style='color: #ccc' title=路虎3 href='http://www.baidu.com' target=_blank>路虎3</a>";
Regex reg = new Regex(@"(?is)<a[^>]*?href=(['""\s]?)(?<href>[^'""\s]*)\1[^>]*?>(?<text>(?:(?!</?a\b).)*)");
            MatchCollection match = reg.Matches(_str);
            for (int i = 0; i < match.Count; i++)
            {
               Response.Write(match[i].Groups["text"].Value + "----" + match[i].Groups["href"].Value);
            }

void Main()
{
    string _str=@"<a style='color: #dffeaa' title=路虎1 href='http://www.baidu.com' target=_blank>路虎1</a>
<a style='color: #000' title=路虎2 href='http://www.baidu.com' target=_blank>路虎2</a>
<a style='color: #ccc' title=路虎3 href='http://www.baidu.com' target=_blank>路虎3</a>";
Regex reg = new Regex(@"(?is)<a[^>]*?style=(['""\s]?)color:(?<color>[^'""]*?)\1[^>]*?href=(['""\s]?)(?<href>[^'""\s]*)\2[^>]*?>(?<text>(?:(?!</?a\b).)*)");
            MatchCollection match = reg.Matches(_str);

            for (int i = 0; i < match.Count; i++)
            {
               Console.WriteLine(match[i].Groups["color"].Value);
               Console.WriteLine(match[i].Groups["text"].Value + "----" + match[i].Groups["href"].Value);
            }

}

------解决方案--------------------
C# code
Regex reg = new Regex(@"(?is)<a[^>]*?style=(['""]?)[^'""]*?color:\s*?(?<color>[^'"";>]*)[^>]*?\1[^>]*?href=(['""\s]?)(?<href>[^'""\s]*)\2[^>]*?>(?<text>(?:(?!</?a\b).)*)");
match[i].Groups["color"].Value //#000

------解决方案--------------------
void Main()
{
   string _str=@"<a style='color: #dffeaa' title=路虎1 href='http://www.baidu.com' target=_blank>路虎1</a>
<a style='color: #000' title=路虎2 href='http://www.baidu.com' target=_blank>路虎2</a>
<a style='color: #ccc' title=路虎3 href='http://www.baidu.com' target=_blank>路虎3</a>";
Regex reg = new Regex(@"(?is)<a\b[^>]*?(style=(?:['""\s]?)color:(?<color>[^'""]*?)\1[^>]*?)?href=(['""\s]?)(?<href>[^'""\s]*)\2[^>]*?>(?<text>(?:(?!</?a\b).)*)");
           MatchCollection match = reg.Matches(_str);

       
}


------解决方案--------------------
[code=C#][/code]var pattern = @"<a\b(?:style\s*=\s*(?<koS>[""']?)[^""']*?color\s*:\s*(?<ColorValue>[#\w]*)[^""']*\k<koS>|\bhref\s*=\s*(?<koH>[""']?)(?<Href>[^""'\s><]*)\k<koH>|[^><])+>(?<Txt>[^<>]*)";
              var testTxt = @"<a title=路虎1 href='http://www.baidu.com' target=_blank>路虎1</a>
<a style='border:1px solid #000; color: #000' title=路虎2 href='http://www.baidu.com' target=_blank>路虎2</a>
<a style='color: #ccc' title=路虎3 href='http://www.baidu.com' target=_blank>路虎3</a>";