Compare part of string in JavaScript

Question

How do I compare a part of a string - for example if I want to compare if string A is part of string B. I would like to find out this: When string A = \"abcd\"

Answer 1

Using regular expression might help you.

var patt = new RegExp(stringA, 'i');
if(stringB.match(patt)){                            
   return true;
}