On 31 Aug 2002 at 10:26, Piers Cawley wrote:
> > my $pattern = rx:w / $1:=(\S+) =<gt> $2:=(\S+) |
> > $2:=(\S+) <lt>= $1:=(\S+) /;
>
> Count the capturing groups. Looks like there's 4 of 'em to me. $1, $2,
> $3 and $4 are automatic variables which, according to the Apocalypse
> get set for every capturing group independent of any named variable to
> which they might also be bound.
Not if those capturing groups have been renumbered.
>From A5:
> You can reorder paren groups by naming them with numeric variables:
>
> / $2:=(.*?), \h* $1:=(.*) /
> If you use a numeric variable, the
> numeric variables will start renumbering from that point, so
> subsequent captures can be of a known number (which clobbers any
> previous association with that number). So for instance you can
> reset the numbers for each alternative:
>
> / $1 := (.*?) (\:) (.*) { process $1, $2, $3 }
> | $1 := (.*?) (=\>) (.*) { process $1, $2, $3 }
> | $1 := (.*?) (-\>) (.*) { process $1, $2, $3 }
> /
So binding to $1 etc is a special case. Your example never captures
to $1..$4 but only to $1,$2 according to the renumbering.
Note that it's actually called 'reordering/renumbering' instead of
'binding' in A5 for numeric variables.
--
Markus Laire 'malaire' <[EMAIL PROTECTED]>
