$re = '/(?<!\S)(?:https?:\/\/)?(?:(?:(?!example)\w+[.-])+[a-z]{2,11})(?!\S)/i';
$str = 'name.url.com name-dev.url.com name-qa.url.com www.example.com test.example.com http://NewMediaFilmFestival.com http://www.test.com https://www.example.com jfsalkjflkdjfa.vuulr.com
jfsalkjflkdjfa.com
';
$subst = "[URl Hidden]";
$result = preg_replace($re, $subst, $str);
echo "The result of the substitution is ".$result;
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for PHP, please visit: http://php.net/manual/en/ref.pcre.php