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<?php $str = 'fix me <a href="www.link.com">link</a> or fix me <a href="link.com">link</a> and fix me too <a href="http://link.com">link</a> and replace me with <a href="http://www.link.com>link</a> <a href="http://www-is-for-world-wide-web.com">buggy!</a>'; echo str_replace('www.www.', 'www.', str_replace('http://www.http://', 'http://www.', str_replace('a href="', 'a href="http://www.', $str)));
Output for git.master, git.master_jit, rfc.property-hooks
fix me <a href="http://www.link.com">link</a> or fix me <a href="http://www.link.com">link</a> and fix me too <a href="http://www.link.com">link</a> and replace me with <a href="http://www.link.com>link</a> <a href="http://www.www-is-for-world-wide-web.com">buggy!</a>

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