How's this?
#!/usr/bin/perl
use strict;
use warnings;
my $input = 'a';
my %po = (
PR1 => 2,
PR2 => 4,
PR3 => 1,
PR4 => 3,
);
foreach my $key (sort { $po{$a} <=> $po{$b} } keys %po) {
$key =~ s/^PR/process/;
$input = eval "$key(\$input)" or die $@;
print $input . $/; # debugging output
}
sub process1 { lc(shift) . 1 }
sub process2 { lc(shift) . 2 }
sub process3 { uc(shift) . 3 }
sub process4 { uc(shift) . 4 }
Output: A3
a31
A314
a3142
Update: eval can be dangerous! Use this solution only if you are sure that the value of $input is safe! Taint mode highly recommended.
---
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