一个字符串难题~
<?php<br />$a="<fieldset>1<fieldset>2<fieldset>3<fieldset>4</fieldset></fieldset></fieldset></fieldset>";<br />echo $a;<br />?>
$a="<fieldset>1<fieldset>2<fieldset>4</fieldset></fieldset></fieldset>";
<br />$a="<fieldset>1<fieldset>2<fieldset>3<fieldset>4</fieldset></fieldset></fieldset></fieldset>";<br />$aa=preg_replace("/((<fieldset>[^<]+){2})(<fieldset>[^<]+((<fieldset>[^<]+<\/fieldset>)*)<\/fieldset>)((<\/fieldset>){2})/isU", "\\1\\4\\6", $a);<br />echo $aa;<br />
