Init

src/main/java/systems/brn/regexinghoppers/RegexingHoppers.java

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+package systems.brn.regexinghoppers;
+
+import net.fabricmc.api.ModInitializer;
+import net.minecraft.inventory.Inventory;
+import net.minecraft.screen.NamedScreenHandlerFactory;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+import java.util.regex.PatternSyntaxException;
+
+public class RegexingHoppers implements ModInitializer {
+    // This logger is used to write text to the console and the log file.
+    // It is considered best practice to use your mod id as the logger's name.
+    // That way, it's clear which mod wrote info, warnings, and errors.
+    public static final Logger LOGGER = LoggerFactory.getLogger("RegexingHoppers");
+
+    @Override
+    public void onInitialize() {
+        // This code runs as soon as Minecraft is in a mod-load-ready state.
+        // However, some things (like resources) may still be uninitialized.
+        // Proceed with mild caution.
+
+        LOGGER.info("RegexingHoppers initialized!");
+    }
+
+    public static boolean shouldNotMove(Inventory hopper, String itemName) {
+        NamedScreenHandlerFactory factory = (NamedScreenHandlerFactory) hopper;
+        String customName = factory.getDisplayName().getLiteralString();
+        if (customName != null) {
+            try {
+                Pattern pattern = Pattern.compile(customName);
+                // Check if the text matches the regex
+                Matcher matcher = pattern.matcher(itemName);
+                return !matcher.matches();
+            } catch (PatternSyntaxException ignored) {
+            }
+        }
+        return false;
+    }
+}