How to remove more than one match in Java using replaceAll()?

Question

Hi there I'am tryinig to remove two o more words in a String with the replaceAll method in Java but I am not good in regex at all and I have not been able to do it. So here is the code:

    public static void main(String[] args) {
    String s= "@class::menu-select @id::calibration-content";
    System.out.println(s.replaceAll("[(@class::)(@id::)]",""));
}

But when I run this what I get is the following text menu-eet brton-ontent BTW the words I am trying to remove are @class:: and @id:: Does anyone knows how to do this ? ¡Thanks in advance!

Answer 1

String#replaceAll accepts a regular expression, and you're passing it a character class of substrings you're looking to replace, which isn't correct.

Instead, you could change the regular expression to look specifically for the substrings:

System.out.println(s.replaceAll("@class::|@id::",""));

This results in the following output:

menu-select calibration-content

Keep in mind that there are more efficient methods of removing substrings from a String than regex.

Answer 2

The expression you used contains [] which matches on the range of characters inbetween. Just use something like:

System.out.println(s.replaceAll("@(class|id)::",""));

Answer 3

This code should work

public static void main(String[] args) {
    String s= "@class::menu-select @id::calibration-content";
    System.out.println(s.replaceAll("@class::|@id::", ""));
}

It prints

menu-select calibration-content