问通过ANTLR解析GUID时出错

EN

grammar Sample;
UID: '^[A-Za-z0-9]{8}-[A-Za-z0-9]{4}-[A-Za-z0-9]{4}-[A-Za-z0-9]{4}-[A-Za-z0-9]{12}$';
literal_value : 
           UID
          ;

    public void compile() {
    String expression = "4B66049D-6E1A-4CE6-8FBF-B31CD8B9E6AF"
    ANTLRInputStream input = new ANTLRInputStream(expression);
    SampleLexer lexer = new SampleLexer(input);
    final CommonTokenStream tokens = new CommonTokenStream(lexer);
    SampleParser parser = new SampleParser(tokens);
    SampleParser.Literal_valueContext context = parser.literal_value();
    System.out.println(context.toStringTree());
}