parameters: (cls, regex)
return_statement: return Regex(regex.pattern, regex.flags)
docstring: Convert a Python regular expression into a ``Regex`` instance.
  
          Note that in Python 3, a regular expression compiled from a
          :class:`str` has the ``re.UNICODE`` flag set. If it is undesirable
          to store this flag in a BSON regular expression, unset it first::
  
            >>> pattern = re.compile('.*')
            >>> regex = Regex.from_native(pattern)
            >>> regex.flags ^= re.UNICODE
            >>> db.collection.insert({'pattern': regex})
  
          :Parameters:
            - `regex`: A regular expression object from ``re.compile()``.
  
          .. warning::
             Python regular expressions use a different syntax and different
             set of flags than MongoDB, which uses `PCRE`_. A regular
             expression retrieved from the server may not compile in
             Python, or may match a different set of strings in Python than
             when used in a MongoDB query.
  
          .. _PCRE: http://www.pcre.org/
docstring_summary: Convert a Python regular expression into a ``Regex`` instance.
docstring_tokens: Convert a Python regular expression into a Regex instance .
function: def from_native(cls, regex):
          """Convert a Python regular expression into a ``Regex`` instance.
  
          Note that in Python 3, a regular expression compiled from a
          :class:`str` has the ``re.UNICODE`` flag set. If it is undesirable
          to store this flag in a BSON regular expression, unset it first::
  
            >>> pattern = re.compile('.*')
            >>> regex = Regex.from_native(pattern)
            >>> regex.flags ^= re.UNICODE
            >>> db.collection.insert({'pattern': regex})
  
          :Parameters:
            - `regex`: A regular expression object from ``re.compile()``.
  
          .. warning::
             Python regular expressions use a different syntax and different
             set of flags than MongoDB, which uses `PCRE`_. A regular
             expression retrieved from the server may not compile in
             Python, or may match a different set of strings in Python than
             when used in a MongoDB query.
  
          .. _PCRE: http://www.pcre.org/
          """
          if not isinstance(regex, RE_TYPE):
              raise TypeError(
                  "regex must be a compiled regular expression, not %s"
                  % type(regex))
  
          return Regex(regex.pattern, regex.flags)
function_tokens: def from_native ( cls , regex ) : if not isinstance ( regex , RE_TYPE ) : raise TypeError ( "regex must be a compiled regular expression, not %s" % type ( regex ) ) return Regex ( regex . pattern , regex . flags )