[antlr-interest] Need help parsing text format

[Isabelle Muszynski]

Hi everyone,

I need to parse text of the form 

BCS123/12.LT12ZX/HAM-BRE.1/bla&&^^%%$$bla.3

where the 1st and 3rd pieces are alphanumeric.

My grammar is shown at the end of this mail.
The problem is that it won't parse the cases where alphanumeric fields only contain for ex. letters :

BCSABC/12.CHARLIE/HAM-BRE.1/bla&&^^%%$$bla.3

I don't understand what I'm doing wrong :-(

TIA,
Isabelle

/*** GRAMMAR ***/
grammar Tokens;

SLASH :       '/';
DASH:   '-' ;
DOT     :       '.';

fragment SPECIAL_CHAR :	
          '`' | '!' | '@' | '$' | '%' | '^' | '&' | '*' | '(' | ')' |
         '+' | '=' | '[' | ']' | ':' | '\'' | '"' | '\\' | '|' | ',' | '<' | '?' ;

fragment DIGIT 	: '0'..'9'	;
	
fragment LETTER :	'a'..'z' | 'A'..'Z' ;	

fragment ALPHA 	:	LETTER | DIGIT;

fragment ANY_CHAR :	ALPHA | SPECIAL_CHAR ;

fragment WS_CHAR  : (' ' | '\t' | '\u000C' ) ;

WS      :       WS_CHAR+;

NEWLINE  : '\r'? '\n' ;

LETTER_WORD :	LETTER+ ;
NUMBER_WORD  :	DIGIT+ ;
ALPHA_WORD  : ALPHA+ ;
FREE_WORD : ANY_CHAR+ ;

load	:	
	ALPHA_WORD
	SLASH
	NUMBER_WORD
	DOT 
	ALPHA_WORD
	SLASH
	LETTER_WORD
	DASH
	LETTER_WORD
	DOT
	NUMBER_WORD
	SLASH
	FREE_WORD
	(DOT NUMBER_WORD)?
	NEWLINE
	;

=
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