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  1. or download this
    my $a = "17341234173412341734123417341234";
$a=~s/(.)(?=...\1)/A/g; 
$a=~s/(?<=A...)(.)/B/g;
print $a;
A7AAB2BBB7BBB2BBB7BBB2BBB7BBB2BB
  2. or download this
    my $a = "17341234173412341734123417341234";
my $n=0; 
$n++ while $a =~ s/(.)(...)\1/A$2B/;
print $n, $a;
12 A7AAB2BBA7AAB2BBA7AAB2BBA7AAB2BB
  3. or download this
    my $a = "17341234173412341734123417341234";
substr($a, $_, 5) =~ s[(.)(...)\1][A$2B] for 0 .. length ($a);
print $a;
A7AAB2BBA7AAB2BBA7AAB2BBA7AAB2BB