Finding uppercase characters within a string

Question

I am trying to write a function that decryptes an encrypted message that has uppercase letters (showing its a new word) and lower case characters (which is the word itself).

Answer 1

I'm not too sure I follow, but you can strip using the replace method and regular expressions

var str = 'MaEfSdsfSsdfsAdfssdGsdfEsdf';
var newmsg = str.replace(/[a-z]/g, '');
var old = str.replace(/[A-Z]/g, '');

In this case, newmsg = 'MESSAGE'.