console.log(("str1,str2,str3,str4".match(/,/g) || []).length); //logs 3 console.log(("str1,str2,str3,str4".match(new RegExp("str", "g")) || []).length); //logs 4
function charCount(myChar, str) { let count = 0; for (let i = 0; i < str.length; i++) if (str.charAt(i) == myChar) count++ return count; }