can flex generate gnurex-like output of yytext?

[Ning Cao]

Dear all,

     I remember that in gnurex, sub regular expressions can be defined as 
variable and
can be retrieved seperately, for example, for a fractional number 3.5 may be 
written as
+3 1/2 .
   
    I would like to get seperated parts of the fraction, such as (3) (1) (2), 
not "+3 1/2" as a
whole word.

    Can I get the same result using yytext like this?

With Regards,
Yours,
Ning Cao