I don't think you need to use [','] for comma as it's a character class and the 
single quotes are superfluous. Try separator => comma and define comma as ','.

Rule should just list: Script ::= Number separator => comma

On Apr 30, 2014, at 2:51, Ion Toloaca <[email protected]> wrote:

> I changed the lexeme for error to [\s\S] and used priorities, this finally 
> seems to work as intended.
> (for some reason it didn't work until I replaced ',' with comma, comma ~[','] 
> and gave it also a priority).
> 
> Now this project seems more achievable, thank you.
> 
> :start ::= Script 
> Script ::= Number comma Number action => do_printNr 
>           | Any
> 
> Any ::= anyToken
>        | anyToken Any
> anyToken ~ [\s\S]
> comma ~ [',']
> :lexeme ~ comma priority => 10
> :lexeme ~ <anyToken> priority => -10
> :lexeme ~ Number priority => 10 
> Number ~ digits
> digits ~ [\d]+
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