Negative Lookbehind

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    Java 15:

    import java.io.*;
    import java.util.*;
    import java.util.regex.Pattern;
    import java.util.regex.Matcher;
    public class Solution {
        public static void main(String[] args) {
            Scanner scanner = new Scanner(System.in);
            Pattern pattern = Pattern.compile("(?<![aeiouAEIOU])(.)");
            Matcher matcher = pattern.matcher(scanner.nextLine());
            int count = 0; 
            while(matcher.find())   count++;
            System.out.println("Number of matches : "+count);
        }
    }