DB<122> $n=1
 => 1

  DB<123> @array[0..$n-1] = split /,(?=https?:)/ , $str , $n+1
 => "http://abc.org"

  DB<124> $n=2
 => 2

  DB<125> @array[0..$n-1] = split /,(?=https?:)/ , $str , $n+1
 => ("http://abc.org", "http://de,f.org")