Using $; 

my $s = 'A3xyz45M98AB7Z9';
my $i = 0;
%_ = map { (++$i, $_) } split /(?<=\d)(?=\D)/, $s;
local $; = ":";
$_{ (),  map { delete $_{$_} } 1..$i  }=0;
print keys %_;

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Couldn't help myself O:-) Sorry :-)

In reply to Re^2: Best way to put : between fields in a string by cog
in thread Best way to put : between fields in a string by eyepopslikeamosquito

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