Javascript: How many times a character occurs in a string

Question

Hi all

Is there a simple way to chack how many times a character appears in a String?

Thanks in Advance Ruth

Answer 1

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

str.replace(/[^a]/g, "").length

Here it is counted how many as are in str.

Answer 2

var s = "dqsskjhfds";
alert(s.length - s.replace(/a/g, "").length); // number of 'a' in the string

Answer 3

Match the character with a regular expression, make it global, count the number of matches.

"aabbaa".match(/a/g).length;

Answer 4

This counts a in below example:

str = "A man is as good as his word";
alert(str.split('a').length-1);

If you want case insensitive you'd want something like

alert(str.split( new RegExp( "a", "gi" ) ).length-1);

So that it grabs "A" and "a" ... "g" flag isn't really needed, but you do need the "i" flag