我对以下三种模式感到困惑,有人会更详细地解释它吗？
## IPython with Python 2.7.3
In [62]: re.findall(r'[a-z]*',"f233op")
Out[62]: ['f', '', '', '', 'op', ''] ## why does the last '' come out?
In [63]: re.findall(r'([a-z])*',"f233op")
Out[63]: ['f', '', '', '', 'p', ''] ## why does the character 'o' get lost?
In [64]: re.findall(r'([a-z]*)',"f233op")
Out[64]: ['f', '', '', '', 'op', ''] ## what's the different than line 63 above?
Java file.length()和Files.size()Java 之间是否存在任何实现差异？Java 7引入了Files.size()方法.
谁能帮忙解决这个问题？
15:02:06,698 ERROR [[jsp]] Servlet.service() for servlet jsp threw exception
java.lang.LinkageError: loader (instance of org/apache/jasper/servlet/JasperLoader): attempted duplicate class definition for name: "org/apache/jsp/tag/web/divBox_tag"
[geronimo 2.1,struts 1.2]