[antlr-interest] token definitions can never be matched because prior tokens match the same input

[matt.jazz]

Hello,

I'm new to ANTLR and i need to create a translator. I encounter a problem with the following grammar.

Grammar :

r0    :    'OK' r1 r2? r3?
       ;

r1    :    'V'
       |    'W'
       ;

r2    :    ('A'..'Z''0..9')('A'..'Z''0..9')('A'..'Z''0..9')
       ;

r3    :    ('A'..'Z''0..9')('A'..'Z''0..9')
       ;

Examples of valid sentences :

OK W 65 0X9
OK V AZ 78F

Error :

The following token definitions can never be matched because prior tokens match the same input

Thanks for your help

Matt


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