Counting upper and lower case characters in a string

Question

First off, I know this is far from professional. I\'m trying to learn how to work with strings. What this app is supposed to do is take a simple text input and do a few thi

Answer 1

Use regular expressions.

Example

var s = "thisIsAstring";
var numUpper = s.length - s.replace(/[A-Z]/g, '').length;  

// numUpper = 2

Se more at JavaScript replace/regex