Question

Write a program that reads a string from the console and replaces all series of consecutive identical letters with a single one.

Examples:

Input	Output
aaaaabbbbbcdddeeeedssaa	abcdedsa

 

Answer 1

Here is the solution:

import java.util.*;

public class Pr_03_SeriesOfLetters {
    public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);
        String input = scanner.nextLine();

        input = input.replaceAll("([a-z])\\1+", "$1");
        System.out.println(input);
    }
}

You can read more about replacement string syntax here: http://manual.macromates.com/en/regular_expressions