<?php
$re = '@\b(([\w-]+://?|www[.])[^\s()<>]+(?:\(\w+\)|([^[:punct:]\s]|/)))@i';
$str = "www.domain.com\nhttp://w...content-available-to-author-only...n.com\nhttp://d...content-available-to-author-only...n.com";
$subst = '<a href="$0" target="_blank">$0</a> ';
echo $result;
PD9waHAKCiRyZSA9ICdAXGIoKFtcdy1dKzovLz98d3d3Wy5dKVteXHMoKTw+XSsoPzpcKFx3K1wpfChbXls6cHVuY3Q6XVxzXXwvKSkpQGknOwokc3RyID0gInd3dy5kb21haW4uY29tXG5odHRwOi8vdy4uLmNvbnRlbnQtYXZhaWxhYmxlLXRvLWF1dGhvci1vbmx5Li4ubi5jb21cbmh0dHA6Ly9kLi4uY29udGVudC1hdmFpbGFibGUtdG8tYXV0aG9yLW9ubHkuLi5uLmNvbSI7CiRzdWJzdCA9ICc8YSBocmVmPSIkMCIgdGFyZ2V0PSJfYmxhbmsiPiQwPC9hPiAnOwokcmVzdWx0ID0gcHJlZ19yZXBsYWNlKCRyZSwgJHN1YnN0LCAkc3RyKTsKZWNobyAkcmVzdWx0Ow==