String#replaceFirst for charakter slash or /

Question

Dear fellow programmers

I'm developing a Java plugin for my minecraft server. Now my issue is that I have a / in a string and want to replace it with nothing AKA "". I tried to use "/", "/", "\/" and "slash" in the first parameter of the replaceFirst method. Either didn't work.

Here is my code:

if (command.startsWith("/")) {
            command.replaceFirst("\\/", "");
            System.out.println("After replace: " + command);
            target.performCommand(command);
            sender.sendMessage("§5" + target.getName() + "§a performed the command §5/" + command);
        }

If you know how I could do this thanks for your help in advance :)

What you have already tried should be working. Please include the actual code. — Tim Biegeleisen, Apr 10 '21 at 10:45
Strings are immutable, so you have to get the return value: `command = command.replaceFirst("/", "");` — Andreas, Apr 10 '21 at 10:48
@Andreas That makes sence. Thanks for your answer. And I'm sorry if I didn't find your duplicate. That's exactly not what I would type in my search bar in this case ;) — ShadowCrafter_01, Apr 10 '21 at 10:53

rzwitserloot · Accepted Answer · 2021-04-10T12:20:04.140

2

Strings are immutable. command.replaceFirst does not change the string that the command reference is pointing at; it creates a new string, and returns a reference to this new string. You'd have to write e.g. command = command.replaceFirst(...).
Given that replaceFirst uses regexes, this is needlessly complicated. Try command = command.substring(1); instead, to lop off the first character.

edited Apr 10 '21 at 12:20

answered Apr 10 '21 at 10:54

rzwitserloot

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Or just use `String#replace` – Tim Biegeleisen Apr 10 '21 at 11:02
@TimBiegeleisen That's not an option for me because there may be more than one slash and I only want to replace the first one – ShadowCrafter_01 Apr 10 '21 at 11:07

String#replaceFirst for charakter slash or /

1 Answers1