regular expression for matching a word

I want to get the variable names in javascript which define a string
for that I have wrote a regular expression

var x = "sdfsfsdf";
 
 ((\w.*?)(\s*=\s*)(['"]*)(.+?)(['"]*)\1)
 

The problem with this expression is when I am using RegExp.$2 I should get the variable name as x as we consider the above code. It works fine with some expression but if there is code like

function(a) {var b = document.createElement("script");}
 

then the result is function(a){var b.


Please help me change my regular expression so it works in both cases.


NOTE: javascript variables can also be declared without var i.e. x = "sdfsfsf";

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Answer:

If your strings won't be too crazy, you can try this:

/[a-z_$][a-z0-9$_]*\s*=\s*.*?(;|$)/gi

Tests:

> var r = /[a-z_$][a-z0-9$_]*\s*=\s*.*?(;|$)/gi;
  undefined
> 'var x = "sdfsfsdf";'.match(r);
  ["x = "sdfsfsdf";"]
> 'function(a) {var b = document.createElement("script");}'.match(r);
  ["b = document.createElement("script");"]