string - How can I use javascript to get a substring of whatever is between two parenthesis? -

i trying return "aa" using javascript.

this doesn't work.

var mystr = "item code alpha tengo (aa)";  var newstr = mystr.substring("(",mystr.lastindexof(")")); 

you can do:

var mystr = 'item code alpha tengo (aa)'; mystr.replace(/^[^(]*\(|\)[^)]*$/g, ''); // aa 

or simpler:

mystr.replace(/.*\(|\).*/g,'')