Allow exceptions to commands

src/main/java/wtf/beatrice/limbomanager/listeners/CommandCanceller.java

@@ -4,13 +4,24 @@ import org.bukkit.event.EventHandler;
 import org.bukkit.event.Listener;
 import org.bukkit.event.player.PlayerCommandPreprocessEvent;
 
+import java.util.ArrayList;
+import java.util.List;
+
 public class CommandCanceller implements Listener
 {
 
+    private final static String allowedCmdsRegex = "\\/(login|register|changepassword)\\b";
+    /*
+    first "/" is the command prefix
+    (login|register|...) means either one or the other
+    \b means end of word (end of string, whitespace, ...) so NO other characters (like /loginabc)
+     */
+
     @EventHandler
     public void onCommand(PlayerCommandPreprocessEvent event)
     {
-        // block literally all commands (except from proxy ones)
-        event.setCancelled(true);
+        if(!event.getMessage().matches(allowedCmdsRegex))
+            // block all commands (except from proxy and allowed ones)
+            event.setCancelled(true);
     }
 }