Connect Digits by rsFalse

$_=<>;
push@_,$1<$2?$1..$2:reverse$2..$1 while/(?=(.)(.))/g;
$_=join '',@_;
print s/(.)\1+/$1x~-length$&/ger

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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