嵌套正则写法,该怎么解决

嵌套正则写法

PHP code

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$string = "some text (a(b(c)d)e) more text"; 
if(preg_match("/\((?>[^()]+|(?R))*\)/",$string,$matches)) 
{ 
echo "<pre class="brush:php;toolbar:false">"; print_r($matches); echo "

"; }

上面是网上找到的嵌套正则写法，把string改成：
$string = 'some text

cde more text';

改成这样后，正则规则我换不过来了，亲大虾帮忙改一下。

最好能做到个数不确定的嵌套匹配

------解决方案--------------------

PHP code

<?php $string = 'some text <tag:cate name="a">a<cate name="b">b<cate>c</cate>d</cate>e more text';
preg_match("/<cate name='\"\w+\")?'>(?>\w+|(?R))*/",$string,$matches) &&
    print_r($matches); <div class="clear">
                 
              
              
        
            </div></cate>