[antlr-interest] Newbie: Token/Rule Difference [again..]

[Trey Cool Shonuff]

Hi all,
I'm totally new to ANTLR and the last time I've really fiddled with language processing was back in college.
Please help me tell why the following two, similar grammars behave differently:

grammar G1;
q	:	WORD;
LETTER 	:	('a'..'z' | 'A'..'Z');
DIGIT 	:	'0'..'9';
WORD	:	(DIGIT | LETTER)+;
--------

grammar G2;
q	:	(DIGIT | LETTER)+;
LETTER 	:	('a'..'z' | 'A'..'Z');
DIGIT 	:	'0'..'9';
--------

I thought that these two were equivalent, however, G1 does not recognize the single-character sentence (throws MismatchedTokenException), while G2 does.

Can you tell me what the actual difference is?
Than You,
-Trevor.




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