split 
use warnings;
use strict;

my $string="A111B111A111B111";
my $yes_or_no="no";
for (split //, $string) {
    if ($_ eq 'A') {
        $yes_or_no = 'yes';
        print "$_ yes_or_no=$yes_or_no\n";
    }
    if ($_ eq 'B') {
        $yes_or_no = 'no';
        print "$_ yes_or_no=$yes_or_no\n";
    }
}

__END__

A yes_or_no=yes
B yes_or_no=no
A yes_or_no=yes
B yes_or_no=no

[download]

In reply to Re: Change variable multiple times within a single string? by toolic
in thread Change variable multiple times within a single string? by JTomb

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