Regex count lowercase letters

[RazvanBugoi]

https://www.codewars.com/kata/56a946cd7bd95ccab2000055/train/javascript

[RazvanBugoi]

function lowercaseCount(str){
    return (/[a-z]/g).exec(str) == null ? 0 : str.match(/[a-z]/g).length;
}

function lowercaseCount(str){
    return str.length - str.replace(/[a-z]/g, '').length;
}