RegExp in JavaScript

 <script type="text/javascript">  
 var str = "mastertablemastertext";  
 var patt1 = /master/i;  
//i is modifier for case-insensitive and g for Global search
 alert(str.match(patt1));  
 </script>  

Arrays in Javascript

 function start() {  
      var example=new Array();  
      example[0]="first";  
      example[1]="esc";  
      for(var i=0;i<example.length;i++){  
           alert(example[i]);  
      }  
      example[example.length]="third";  
      alert(example.length+" "+example["esc"]);  
 }