Catch pattern syntax

worldedit-core/src/main/java/com/sk89q/worldedit/extension/factory/DefaultMaskParser.java

@@ -24,6 +24,7 @@ import com.sk89q.worldedit.world.block.BlockStateHolder;
 
 import java.util.*;
 import java.util.regex.Pattern;
+import java.util.regex.PatternSyntaxException;
 
 public class DefaultMaskParser extends FaweParser<Mask> {
     private final Dispatcher dispatcher;
@@ -115,6 +116,7 @@ public class DefaultMaskParser extends FaweParser<Mask> {
                                 mask = parseFromInput(command.substring(1, end == -1 ? command.length() : end), context);
                             } else {
                                 List<String> entries = entry.getValue();
+                                try {
                                     BlockMaskBuilder builder = new BlockMaskBuilder().addRegex(pe.full);
                                     if (builder.isEmpty()) {
                                         try {
@@ -127,6 +129,9 @@ public class DefaultMaskParser extends FaweParser<Mask> {
                                         }
                                     }
                                     mask = builder.build(extent);
+                                } catch (PatternSyntaxException regex) {
+                                    throw new InputParseException(regex.getMessage());
+                                }
                             }
                         }
                     }