Added proper support for global regions and a region ID validation regex.

src/com/sk89q/worldguard/bukkit/commands/RegionCommands.java

@@ -55,7 +55,15 @@ public static void define(CommandContext args, WorldGuardPlugin plugin,
         
         Player player = plugin.checkPlayer(sender);
         WorldEditPlugin worldEdit = plugin.getWorldEdit();
-        String id = args.getString(0).replace(".", "");
+        String id = args.getString(0);
+        
+        if (!ProtectedRegion.isValidId(id)) {
+            throw new CommandException("Invalid region ID specified!");
+        }
+        
+        if (id.equalsIgnoreCase("__global__")) {
+            throw new CommandException("A region cannot be named __global__");
+        }
         
         // Attempt to get the player's selection from WorldEdit
         Selection sel = worldEdit.getSelection(player);
@@ -111,6 +119,10 @@ public static void redefine(CommandContext args, WorldGuardPlugin plugin,
         LocalPlayer localPlayer = plugin.wrapPlayer(player);
         String id = args.getString(0);
         
+        if (id.equalsIgnoreCase("__global__")) {
+            throw new CommandException("The region cannot be named __global__");
+        }
+
         RegionManager mgr = plugin.getGlobalRegionManager().get(world);
         ProtectedRegion existing = mgr.getRegion(id);
 
@@ -182,7 +194,15 @@ public static void claim(CommandContext args, WorldGuardPlugin plugin,
         Player player = plugin.checkPlayer(sender);
         LocalPlayer localPlayer = plugin.wrapPlayer(player);
         WorldEditPlugin worldEdit = plugin.getWorldEdit();
-        String id = args.getString(0).replace(".", "");
+        String id = args.getString(0);
+        
+        if (!ProtectedRegion.isValidId(id)) {
+            throw new CommandException("Invalid region ID specified!");
+        }
+        
+        if (id.equalsIgnoreCase("__global__")) {
+            throw new CommandException("A region cannot be named __global__");
+        }
         
         // Attempt to get the player's selection from WorldEdit
         Selection sel = worldEdit.getSelection(player);
@@ -310,6 +330,10 @@ public static void info(CommandContext args, WorldGuardPlugin plugin,
             id = args.getString(1).toLowerCase();
         }
         
+        if (!ProtectedRegion.isValidId(id)) {
+            throw new CommandException("Invalid region ID specified!");
+        }
+        
         RegionManager mgr = plugin.getGlobalRegionManager().get(world);
         
         if (!mgr.hasRegion(id)) {
@@ -435,8 +459,13 @@ public static void flag(CommandContext args, WorldGuardPlugin plugin,
         ProtectedRegion region = mgr.getRegion(id);
 
         if (region == null) {
+            if (id.equalsIgnoreCase("__global__")) {
+                region = new GlobalProtectedRegion(id);
+                mgr.addRegion(region);
+            } else {
                 throw new CommandException("Could not find a region by that ID.");
             }
+        }
         
         if (region.isOwner(localPlayer)) {
             plugin.checkPermission(sender, "worldguard.region.flag.own");
@@ -518,6 +547,10 @@ public static void setPriority(CommandContext args, WorldGuardPlugin plugin,
         String id = args.getString(0);
         int priority = args.getInteger(1);
         
+        if (id.equalsIgnoreCase("__global__")) {
+            throw new CommandException("The region cannot be named __global__");
+        }
+        
         RegionManager mgr = plugin.getGlobalRegionManager().get(world);
         ProtectedRegion region = mgr.getRegion(id);
 
@@ -560,6 +593,10 @@ public static void setParent(CommandContext args, WorldGuardPlugin plugin,
         String id = args.getString(0);
         String parentId = args.getString(1);
         
+        if (id.equalsIgnoreCase("__global__")) {
+            throw new CommandException("The region cannot be named __global__");
+        }
+        
         RegionManager mgr = plugin.getGlobalRegionManager().get(world);
         ProtectedRegion region = mgr.getRegion(id);
         ProtectedRegion parent = mgr.getRegion(parentId);

src/com/sk89q/worldguard/protection/databases/YAMLDatabase.java

@@ -33,6 +33,7 @@
 import com.sk89q.worldguard.domains.DefaultDomain;
 import com.sk89q.worldguard.protection.flags.DefaultFlag;
 import com.sk89q.worldguard.protection.flags.Flag;
+import com.sk89q.worldguard.protection.regions.GlobalProtectedRegion;
 import com.sk89q.worldguard.protection.regions.ProtectedCuboidRegion;
 import com.sk89q.worldguard.protection.regions.ProtectedPolygonalRegion;
 import com.sk89q.worldguard.protection.regions.ProtectedRegion;
@@ -86,6 +87,8 @@ public void load() throws IOException {
                     Integer maxY = checkNonNull(node.getInt("max-y"));
                     List<BlockVector2D> points = node.getBlockVector2dList("points", null);
                     region = new ProtectedPolygonalRegion(id, points, minY, maxY);
+                } else if (type.equals("global")) {
+                    region = new GlobalProtectedRegion(id);
                 } else {
                     logger.warning("Unknown region type for region '" + id + '"');
                     continue;
@@ -181,6 +184,8 @@ public void save() throws IOException {
                 }
                 
                 node.setProperty("points", points);
+            } else if (region instanceof GlobalProtectedRegion) {
+                node.setProperty("type", "global");
             } else {
                 node.setProperty("type", region.getClass().getCanonicalName());
             }

src/com/sk89q/worldguard/protection/regions/ProtectedRegion.java

@@ -28,6 +28,7 @@
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.regex.Pattern;
 
 /**
  * Represents a region of any shape and size that can be protected.
@@ -35,6 +36,9 @@
  * @author sk89q
  */
 public abstract class ProtectedRegion implements Comparable<ProtectedRegion> {
+    
+    private static final Pattern idPattern = Pattern.compile("^[A-Za-z0-9_,'\\-\\+/]{1,}$");
+    
     /**
      * Holds the region's ID.
      */
@@ -343,6 +347,16 @@ public abstract List<ProtectedRegion> getIntersectingRegions(
             List<ProtectedRegion> regions)
             throws UnsupportedIntersectionException;
     
+    /**
+     * Checks to see if the given ID is accurate.
+     * 
+     * @param id
+     * @return
+     */
+    public static boolean isValidId(String id) {
+        return idPattern.matcher(id).matches();
+    }
+    
     /**
      * Thrown when setting a curParent would create a circular inheritance
      * situation.