Answers for "count how many times a character appears in a string javascript"

javascript count occurrences of letter in string

function count(str, find) {
    return (str.split(find)).length - 1;
}

count("Good", "o"); // 2

count occurrences of character in string javascript

var temp = "This is a string.";
var count = (temp.match(/is/g) || []).length;
console.log(count);

Output: 2

Explaination : The g in the regular expression (short for global) says to search the whole string rather than just find the first occurrence. This matches 'is' twice.

javascript count number of times character appears in string

You could remove any other character in the string and check the length:

str.replace(/[^aA]/g, "").length
Here it is counted how many as are in str. The RegExp is described below:

[ // Start Character Group
^ // Not operator in character group
a // The character "a"
] // End character group

//The g (global) in the regular expression tells the program to search 
//the whole string rather than just finding the first occurrence.