[antlr-interest] greedy/non-greedy problem.

[jbb at acm.org]

Bharath :-

>I replaced it with IDENT DOT IDENT DOT (IDENT (DOT IDENT)*)? And it worked.

Good. I am glad that worked for you.

But you do realize that the above rule recognizes a different
language than your original rule?

If remember correctly your original rule was:

myParserRule: IDENT DOT IDENT DOT ( IDENT DOT )* IDENT ;

in which the third, trailing, IDENT is a REQUIRED element, while in:

myParserRule: IDENT DOT IDENT DOT ( IDENT ( DOT IDENT )* )? ;

the third, trailing, IDENT is an OPTIONAL element.

Thus I think that the second rule accepts "a.b." while the first would
reject.



 
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