Count Vowels

Given a string arg, count the vowels and return the number.

Go

package countvowels

import "regexp"

// CountVowels should have a comment documenting it.
func CountVowels(arg string) int {
  return len(regexp.MustCompile(`[^aeiouAEIOU]`).ReplaceAllString(arg, ""))
}
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Java

class CountVowels {
    Integer run(String inputString) {
        return inputString.replaceAll("[^aeiouAEIOU]", "").length();
    }
}
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JavaScript

const run = (arg) => arg.replace(/[^aeiou]/gi, '').length;
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PHP

<?php

function countVowels($str)
{
    return strlen(preg_replace("/[^aeiou]/i", "", $str));
}
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Python

import re

def run(src):
    return len(re.sub("[^aeiouAEUIO]", "", src))
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Ruby

class CountVowels
    def self.count(input)
        flt = input.gsub(/[^aeiou]/i, '')
        return flt.length
    end
end
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Rust

extern crate regex;
use regex::Regex;

pub fn count_vowels(s: String) -> usize {
    return Regex::new("[^aeiouAEIOU]").unwrap().replace_all(&s, "").len();
}
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