How to count Vowels in a given string in javascript?

Its simple and easy.. just write a function and match for regex and return the output like below

function:

function getVowels(str) {

  var m = str.match(/[aeiou]/gi);

  return m === null ? 0 : m.length;

getVowels("Anshul");    //output --> 2

getVowels("TRY");    //output --> 0

getVowels("AEIOU");    //output --> 5

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