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run code in 200+ php & hhvm versions
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<?php $output = "<a href='url' title='post_title'>link_text</a>"; preg_match("/href='(.*?)'/i", $output, $matches); var_dump($matches);
Output for 4.3.0 - 7.2.0
array(2) { [0]=> string(10) "href='url'" [1]=> string(3) "url" }