Question

How to replace consecutive characters with only one using RegEx in Java

Answer 1

import java.util.regex.Pattern;

public class RemoveConsecutiveDuplicates {
    public static void main(String[] args) {
        String input = "aaaabbbccdddddd";

        // Define a regex pattern to match consecutive duplicate characters
        String pattern = "(.)\\1+";

        // Replace matches with the first captured group
        String result = input.replaceAll(pattern, "$1");

        System.out.println("Original: " + input);
        System.out.println("Modified: " + result);
    }
}



/*
run:

Original: aaaabbbccdddddd
Modified: abcd

*/

 

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