I suspect that this question is related to the current Perl Review golfing challenge, but here is a solution to your problem. I could give you a regex-based solution but it would be more complicated and probably less efficient.
#!/usr/local/bin/perl -w
use strict;
my @x;
$_="blah";
for my $i (0..length($_)-2)
{
$x[$i]=substr($_,$i,1).substr($_,$i+1,1);
}
print "@x\n";
produces...
bl la ah
metadoktor
"The doktor is in."
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