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<?php $input = "[link=xxx]xxx[/link] [link=yyy][/link]"; echo preg_replace_callback('/\[link=(.*?)\](.*?)\[\/link\]/', function ($m) { return "<a href=\"$m[1]\">" . (strlen($m[2]) ? $m[2] : $m[1]) . '</a>'; }, $input);
Output for git.master, git.master_jit, rfc.property-hooks
<a href="xxx">xxx</a> <a href="yyy">yyy</a>

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