Sorry about using up a question to answer an old one
(looks like you can't answer or reply to questions that
are more than 3 months old ;-) viz.,

1597320

I've updated the example mentioned there to work with
Antlr v3; the grammar follows.

			

			grammar Data;
			

			

			class P extends Parser;
			

			file: (    sh=SHORT
			

			{System.out.println(sh.getText());}
			

			|  st=STRING
			

			{System.out.println(""" +
			

			st.getText() + """);}
			

			)+
			

			;
			

			

			class L extends Lexer;
			

			options {
			

			charVocabulary='u0000'..'u00FF';
			

			k=2;
			

			}
			

			

			// match the marker followed by any two bytes
			

			SHORT returns[int v]
			

			:   'u0000'
			

			// pack the bytes into a two-byte short
			

			high=. {$v = high
			<
			<8;}
			

			low=. {$v += low;}
			

			{
			

			// make a string out of the value
			

			setText("" + $v);
			

			}
			

			;
			

			

			STRING
			

			:   'u0001'   // begin string (discard)
			

			(options {greedy=false;} :.)*
			

			'u0002'   // end string (discard)
			

			{
			

			// The "!" discard operator removed in v3. :-(
			

			String v=getText();
			

			setText(v.substring(1, v.length()-1));
			

			}
			

			;