Not sure your parameters. Do you mean all pairs of numerically consecutive digits? Or just adjacent digits? Does the string contain alphabetics? Although everyone loves to show off their regex foo, not all solutions require a regex. Perhaps this:
my $s = "abc12341xyz";
my @pairs = grep /\d\d/, map { substr $s, $_, 2 } (0..length($s)-2);
print join " ", @pairs;
12 23 34 41
s//----->\t/;$~="JAPH";s//\r<$~~/;{s|~$~-|-~$~|||s
|-$~~|$~~-|||s,<$~~,<~$~,,s,~$~>,$~~>,,
$|=1,select$,,$,,$,,1e-1;print;redo}
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