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<?php $string = '<p id="keepthis"> text</p><div id="foo">text</div><div id="bar">more text</div><a id="red"href="page6.php">Page 6</a><a id="green"href="page7.php">Page 7</a>'; echo preg_replace_callback( '/(?<=<div|<a)( *id="[^"]+")/', function ($match) { return " "; }, $string );
Output for git.master, git.master_jit, rfc.property-hooks
<p id="keepthis"> text</p><div >text</div><div >more text</div><a href="page6.php">Page 6</a><a href="page7.php">Page 7</a>

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