正则表达式 去掉两个签之间的字符串

表达式是

String regex7 ="(?is)(?<=<detail_desc>).*?(?=</detail_desc>)";

正则是盗用的~~

http://bbs.csdn.net/topics/360186377?page=1#post-394477974

正则表达式如何删除两个字符串间的字符