Answers for "how to count certain words in a string in js"

javascript count occurrences of letter in string

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

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

javascript count words in string

var str = "your long string with many words.";
var wordCount = str.match(/(\w+)/g).length;
alert(wordCount); //6

//    \w+    between one and unlimited word characters
//    /g     greedy - don't stop after the first match