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#! /usr/local/bin/perl

...
} else {
    print "strings $string1 and $string2 do not match!\n";
}

matching part: the date is to
difference: day
difference: morrow

...
$concat = $string1 . "#!!#" . $string2;

if ( $concat =~ m/^(.*)(.*)#!!#\1(.*)$/ ) {
...