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print out the first n vowels in a given string
private static int countMatches(Matcher matcher) {
int counter = 0;
while (matcher.find())
return counter;
public String firstNVowels(String str, int n) {
Pattern pattern = Pattern.compile("(?i)[aeiou]");
Matcher matcher = pattern.matcher(str);
System.out.println(String.format("Number of matchers: %d", countMatches(matcher)));
if (countMatches(matcher) < n) {
return "invalid";
StringBuilder result = new StringBuilder();
while (matcher.find()) {
for (int i = 1; i <= n; i++) {
return result.toString();
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