using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;


namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            string input = @"
               <a asdf = href=  >BLANK</a>
               <a href= a""'tz target=_self >ATZ</a>
               <a href=/2012/02/26/world/meast/iraq-missing-soldier-id/index.html?hpt=hp_bn1 target=""_self"">Last missing U.S. soldier in Iraq ID'd</a>
               <a id=""weatherLocBtn"" href=""javascript:MainLocalObj.Weather.checkInput('weather',document.localAllLookupForm.inputField.value);""><span>Go</span></a>
               <a href=""javascript:CNN_handleOverlay('profile_signin_overlay')"">Log in</a>
               <a no='href' here> NOT FOUND </a>
               <a this href= is_ok > OK </a>
            ";
            string regex = @"
               <a 
                 (?=\s) 
                 (?:[^>""']|""[^""]*""|'[^']*')*?
                 (?<=\s) href \s* =
                 (?: (?>              \s* (['""]) (?<URL>.*?)     \1       )
                   | (?> (?!\s*['""]) \s*         (?<URL>[^\s>]*) (?=\s|>) )   
                 )
                 (?> (?:"".*?""|'.*?'|[^>]?)+ )
                 (?<!/)
               >
               (?<TEXT>.*?)
               </a \s*>
            ";
            string output = Regex.Replace(input, regex, "${TEXT} [${URL}]",
                                RegexOptions.IgnoreCase |
                                RegexOptions.Singleline |
                                RegexOptions.IgnorePatternWhitespace);

            Console.WriteLine(input + "\n------------\n");
            Console.WriteLine(output);
        }
    }
}