sre_constants.error: nothing to repeat in jython

Question

我有html内容我想从这个内容中获得评论

content = """<html>
<body>
<!--<h1>test</h1>-->
<!--<div>
    <img src='x'>
  </div>-->

Blockquote

<!--
  <div>
    <img src='xe'>
  </div>
-->
</body>
</html>"""

我使用这个正则表达式

regex_str = "<!--((\n|\r)+)?((.*?)+((\n|\r)+)?)+-->"

当运行这一行在Python

re.findall(regex_str,content)

运行成功

但是当运行在 jython 出现这个错误

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/share/java/jython-2.7.2.jar/Lib/re$py.class", line 177, in findall
  File "/usr/share/java/jython-2.7.2.jar/Lib/re$py.class", line 242, in _compile
sre_constants.error: nothing to repeat

Answer 1

使用

<!--[\n\r]*([\w\W]*?)[\n\r]*-->

参见regex proof。

解释

--------------------------------------------------------------------------------
  <!--                     '<!--'
--------------------------------------------------------------------------------
  [\n\r]*                  any character of: '\n' (newline), '\r'
                           (carriage return) (0 or more times
                           (matching the most amount possible))
--------------------------------------------------------------------------------
  (                        group and capture to :
--------------------------------------------------------------------------------
    [\w\W]*?                 any character of: word characters (a-z,
                             A-Z, 0-9, _), non-word characters (all
                             but a-z, A-Z, 0-9, _) (0 or more times
                             (matching the least amount possible))
--------------------------------------------------------------------------------
  )                        end of 
--------------------------------------------------------------------------------
  [\n\r]*                  any character of: '\n' (newline), '\r'
                           (carriage return) (0 or more times
                           (matching the most amount possible))
--------------------------------------------------------------------------------
  -->                      '-->'

sre_constants.error: nothing to repeat in jython

sre_constants.error: nothing to repeat in jython

python

regex

jython