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<?php $content = 'Some text that contains src <iframe src="www.example.com"/ data-type="<iframe" data-whoops=" src= oh my"> Some text'; echo preg_replace('~<iframe[^>]*\K (?=src=)~i', ' data-', $content);
Output for git.master, git.master_jit, rfc.property-hooks
Some text that contains src <iframe src="www.example.com"/ data-type="<iframe" data-whoops=" data-src= oh my"> Some text

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