$re = '/[^"]([0-9a-zа-я\.-]{2,}\.(?:ru|com|net)(?:\/[^\s]*)?)[^"]/iu';
$str = 'Какой-то текст www.rambler.ru еще какой то текст <script src="www.google.com"> текст
перенос peter.ru текста и еще текст http://mail.com/dld/dd?sdld=dld ntrls sdlsdlds
slsalsf http://www.website.com sldsl
<script src=\'www.google.com\'> asdsd fsd f';
preg_match_all($re, $str, $matches, PREG_SET_ORDER, 0);
// Print the entire match result
var_dump($matches);
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