regexp grammar correction so that [^] can't be parsed as a range containing ^
regexp grammar correction so that [^] can't be parsed as a range containing ^

svn: r12956

mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket