letters = new Array("a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z");

numbers = new Array(1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26);

colors  = new Array("FF","CC","99","66","33","00");

var endResult;

function doTest()

{

   endResult = "";

   // make up email address

   for (var k=0;k<4000;k++)

   {

      name = makeName(6);

      (k%2)?email=name+"@mac.com":email=name+"(at)mac.com";

      // validate the email address

      var pattern = /^[a-zA-Z0-9\-\._]+@[a-zA-Z0-9\-_]+(\.?[a-zA-Z0-9\-_]*)\.[a-zA-Z]{2,3}$/;

      if(pattern.test(email))

      {

         var r = email + " appears to be a valid email address.";

         addResult(r);

      }

      else

      {

         r = email + " does NOT appear to be a valid email address.";

         addResult(r);

      }

   }

   // make up ZIP codes

   for (var s=0;s<4000;s++)

   {

      var zipGood = true;

      var zip = makeNumber(4);

      (s%2)?zip=zip+"xyz":zip=zip.concat("7");

      // validate the zip code

      for (var i = 0; i < zip.length; i++) {

          var ch = zip.charAt(i);

          if (ch < "0" || ch > "9") {

              zipGood = false;

              r = zip + " contains letters.";

              addResult(r);

          }

      }

      if (zipGood && zip.length>5)

      {

         zipGood = false;

         r = zip + " is longer than five characters.";

         addResult(r);

      }

      if (zipGood)

      {

         r = zip + " appears to be a valid ZIP code.";

         addResult(r);

      }

   }

}

function makeName(n)

{

   var tmp = "";

   for (var i=0;i<n;i++)

   {

      var l = Math.floor(26*Math.random());

      tmp += letters[l];

   }

   return tmp;

}

function makeNumber(n)

{

   var tmp = "";

   for (var i=0;i<n;i++)

   {

      var l = Math.floor(9*Math.random());

      tmp = tmp.concat(l);

   }

   return tmp;

}

function addResult(r)

{

   endResult += "\n" + r;

}

doTest();