php正则组平衡有关问题

php正则组平衡问题
Compilation failed: syntax error in subpattern name (missing terminator) at offset 46

PHP code

<!--Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->$str = "<div class="a">
<div>cc</div>a<span>ab</span>c<div class="b">xxxy</div>
</div>";preg_match_all("#((?'open'<div>]*>)((?:.(?!?div))*.)*?)((?'-open'</div>[^>]*>)((?:.(?!?div))*.)*?)#is",$str,$matches); print_r($matches);

 

请教一下，是不是PHP 不支持组平衡啊

------解决方案--------------------
"#((?'open'

]*>)((?:.(?!?div))*.)*?)((?:'-open'

[^>]*>)((?:.(?!?div))*.)*?)#is",