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<?php $str = 'Lorem ipsum dolor sit amet, adipisicing <img src="http://example.com/img.jpg" />consequat.'; var_export( preg_filter('/.*?<img(?= ).*? src=([\'"])((?:(?!\1).)*)\1.*/ius', '$2', $str) ); echo "\n---\n"; $str = 'Lorem ipsum dolor sit amet, adipisicing <img src="" />consequat.'; var_export( preg_filter('/.*?<img(?= ).*? src=([\'"])((?:(?!\1).)*)\1.*/ius', '$2', $str) ); echo "\n---\n"; $str = 'omg no img tag!'; var_export( preg_filter('/.*?<img(?= ).*? src=([\'"])((?:(?!\1).)*)\1.*/ius', '$2', 'omg no img!') );
Output for git.master, git.master_jit, rfc.property-hooks
'http://example.com/img.jpg' --- '' --- NULL

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