Hi All,

My ANTLR code is as follow :

LPARENTHESIS : ('('); 
RPARENTHESIS : (')'); 

fragment CHARACTER : ('a'..'z'|'0'..'9'|); 
fragment QUOTE     : ('"'); 
fragment WILDCARD  : ('*'); 
fragment SPACE     : (' '|'\n'|'\r'|'\t'|'\u000C'|';'|':'|','); 

WILD_STRING 
   : (CHARACTER)* 
     ( 
       ('?') 
       (CHARACTER)* 
     )+ 
   ; 
PREFIX_STRING 
   : (CHARACTER)+
     ( 
       ('*')  
     )+ 
   ; 
WS     : (SPACE) { $channel=HIDDEN; }; 
PHRASE : (QUOTE)(LPARENTHESIS)?(WORD)(WILDCARD)?(RPARENTHESIS)?((SPACE)+(LPARENTHESIS)?(WORD)(WILDCARD)?(RPARENTHESIS)?)*(SPACE)+(QUOTE); 
WORD   : (CHARACTER)+; 

What I would like to do is to replace all characters marked as space to be replaced with actual space character in the PHRASE. Also if possible, I would then like all continuous spaces to be represented by a single space.

Any help would be most appreciated. For some reason, I am finding it hard to understand ANTLR. Any good tutorials out there ?