[Codewars] Regex count lowercase letters (8 kyu) / JavaScript

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

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DESCRIPTION:

Your task is simply to count the total number of lowercase letters in a string.

 

Examples

lowercaseCount("abc"); ===> 3

lowercaseCount("abcABC123"); ===> 3

lowercaseCount("abcABC123!@€£#$%^&*()_-+=}{[]|\':;?/>.<,~"); ===> 3

lowercaseCount(""); ===> 0;

lowercaseCount("ABC123!@€£#$%^&*()_-+=}{[]|\':;?/>.<,~"); ===> 0

lowercaseCount("abcdefghijklmnopqrstuvwxyz"); ===> 26

 

코드

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