JavaScript - Indexof Or Regexp?

<script>
function convert(theForm){
  var els = theForm.getElementsByTagName('input');// store inputs
  var q = els[0], color = els[1];

  if(els[4].checked){// submit to google
    theForm.action = 'http://www.google.com/search';
    return true;
  };

  color.value = "Chosen "+ q.value +" color";
  switch(q.value){// check the query
    case 'red':
    case 'green':
    case 'blue':
      location.href = color.value;
      return false;
    break;   
    default:
      theForm.action="http://www.google.com/search";
    break;
  };
  return true;
};
</script>

<form name= "myform" onsubmit='return convert(this)'> <input name='q' type='text' /> 
<input name='color' type='hidden' /> <input type='submit' value=" Enter " />
<br />
<input name="searchType" type="radio" value="" checked="checked" > <label for="all"> My Form </label>
<input name="searchType" type="radio" value="google" onclick="document.myform.action='http://www.google.com/search';" /> 
<label for="google"> Google Search </label></form>

$("#submitme").live('click', function() {
    var mystringId = prodID;
    var addedOn = new Date();
	
    $('select').each(function() {
        var selectId= $(this).attr("id");
        var selectedOption = $(this).find('option:selected');
        var selectedOptionValue = selectedOption.val();

        mystringId += '{' + selectId + '}' + selectedOptionValue;
    });
        db.transaction(function(tx) {
        tx.executeSql('SELECT COUNT(*) AS total FROM customers_basket WHERE products_unique_id ="'+ mystringId +'"', [], function (tx, results) {
        total = results.rows.item(0)['total'];
    
    if (total == 0){
    
    $('select').each(function() {
        
        var selectName= $(this).attr("name");
        var selectId= $(this).attr("id");
        var selectedOption = $(this).find('option:selected');
        var selectedOptionValue = selectedOption.val();
        var selectedOptionText = selectedOption.text();

        db.transaction(function(tx) {
		tx.executeSql('INSERT INTO customers_basket_attributes (customers_id, products_id, products_unique_id, customers_basket_quantity, products_options_id, products_options_txt, products_options_value_id, products_options_value_txt) values ("1" , "'+prodID+'" , "'+mystringId+'" ,"1", "'+selectId+'" , "'+selectName+'" , "'+selectedOptionValue+'" , "'+selectedOptionText+'")');
        });
		
    });
	
    db.transaction(function(tx) {	
	tx.executeSql('INSERT INTO customers_basket (customers_id, products_id, products_unique_id, customers_basket_quantity, final_price, customers_basket_date_added) values ("1" , "'+prodID+'" , "'+mystringId+'" , "1" , "0" , "'+addedOn+'")');
    });
	
	}else{
	tx.executeSql('UPDATE customers_basket SET customers_basket_quantity = customers_basket_quantity + 1 WHERE products_unique_id ="'+ mystringId +'"');
	tx.executeSql('UPDATE customers_basket_attributes SET customers_basket_quantity = customers_basket_quantity + 1 WHERE products_unique_id ="'+ mystringId +'"'); 
	
	}
	});
		});
$('.ui-dialog').dialog('close');

});

    for(key in products_options_array)
        {
       
    var value=products_options_array[key];
	    
	    prodOpId = value['products_options_id'];
	    prodOpName = value['products_options_name'];
        prodOpValueId = value['products_options_values_id'];
	    prodOpValueName = value['products_options_values_name'];
		prodOpValuePrice = value['options_values_price'];
		prodOpValuePrefix = value['price_prefix'];
	   
    var arr = [
        {
        optionname: prodOpName,
        optionvalue: prodOpValueName,
		optionnameid: prodOpId,
		optionvalueprice: prodOpValuePrice,
		optionvaluepriceprefix: prodOpValuePrefix,
		}
        ];


    for (var i = 0; i < arr.length; i++) {
    var r = arr[i];
	//console.log(r);
        name    = r.optionname;
        val     = r.optionvalue;
		nameid  = r.optionnameid;
		valueid = r.optionvalueid;
		price = r.optionvalueprice;
		prefix = r.optionvaluepriceprefix;
    if ($("#prodAttributes_"+prodID+" select").is("[name*=" + name + "]")) {

	var select = $("#prodAttributes_"+prodID).find("select[name*=" + name + "]");
    var option = $("<option>");
        option.val(valueid);
		if (price == 0){
        option.text(val);
		}else{
        option.text(val+ ' (' +prefix+ ' ' +price+ ') ');
		}
		select.append(option);
      } else {
  
    var select = $("<select>");
        select.attr("name", name);
        select.attr("id", nameid);
    var option = $("<option>");
        option.val(valueid);
		if (price == 0){
        option.text(val);
		}else{
        option.text(val+ ' (' +prefix+ ' ' +price+ ') ');
		}
        select.append(option);
	var label = $("<label>");
		label.attr("class", "select");
        label.attr("for", name);
    
        
		label.text(name);
	    fieldset.append(select);
        myform.append(div);
        $(myform).appendTo("#prodAttributes_"+prodID);

        }
	
        }
	    }
        myform.append(myinput);	
        myform.trigger('create');

new RegExp("[a-zA-z0-9_].+@[a-zA-z0-9_].+");

 for (;z0<wary.length;z0++){
  reg=new RegExp('\\b'+wary[z0][0]+'\\b','g');
  html=html.replace(reg,'<a>'+wary[z0][0]+'</a>');
 }
 html=html.replace(/zxc/g,'<');

 for (;z0<wary.length;z0++){
  reg=new RegExp('\\b'+wary[z0][0]+'\\b','gi');
  html=html.replace(reg,'<a>$1</a>');
 }
 html=html.replace(/zxc/g,'<');

<html>
	<head>
		<script>
			function testemail(){
			var fld= document.getElementById("input1").value;
			var reg = /^[\w+]@[\w+].com$/i;
			if(reg.test(fld))
			{
				alert("email is ok");
			}
			else
			{
				alert("email is not correct");
			}

			}
		</script>
	</head>
	<body>
		<p>
			<form name="form1" onsubmit="testemail()">
				enter email : <input id="input1" type="text" /> <input id="input2" type="submit" value="Submit" />
			</form>
		</p>
	</body>
</html>

var testStr = '99999+((-25.533) - 5)/99*(-25.533)';
var negValTestStr = new RegExp('\\(\-{1}[0-9]*\.?[0-9]*\\)', 'g');
var test = testStr.match(negValTestStr)
alert(test);

var X = '^(?=.*?(';
var Y = 'dog))(?=.*?(cat))(?=.*?(mouse'; // this gets created dynamically
var Z = ')).*$';

var A = X + Y + Z;
// result is ^(?=.*?(dog))(?=.*?(cat))(?=.*?(mouse)).*$ and is a valid and tested expression

var B = new RegExp(A, 'i');

/([0-9A-z]+)\/?(.*)/

<script language="javascript" type="text/javascript">


document.write('\\Green Apple\\u003c\\\/a>'.match(/(.*)\\\\u003c\\\\\\\/a>/));

</script>

		function nameValidator(entry, msg)
		{
			var regExp = new RegExp("[a-z ]", "g");
			var s_regExp = new RegExp("[ ]");
			var tub = entry.value;
			var newLength = parseInt(tub.length);
			var i = 0;
			var space = 0;

			if (tub == "" || newLength > 20)
			{
				alert(msg + "entry must be > 1 and < 20 characters only!");
				return false;
			}
			else if (tub.match(regExp))
			{
				for (i=0; i < newLength; i++)
				{
					if (tub.substr(i,1) == "")
					{
						space += 1;
					}
				}
				if (space < 1)
				{
					alert(popup + "you must enter a space.")
					return false;
				}
				if (space > 1)
				{
					alert(msg + "you cannot enter a space more than once.");
					return false;
				}
				if (tub.substr(0,1) == s_regExp ||
				    tub.substr(newLength,1) == s_regExp)
				{
					alert(popup + "the first and last characters cannot be whitespace.");
					return false;
				}
                           }
                      return true;
                 }

<div class="widgetWrap">
<div class="group1">
<h3><span>2010 Ford Escape XLT</span></h3>
<dl id="vPrice">
<dt>2010 Ford Escape XLT Prices</dt>