old_contents: # encoding: utf-8
  
  """
  .. codeauthor:: Tsuyoshi Hombashi <gogogo.vm@gmail.com>
  """
  
  from __future__ import absolute_import
  from __future__ import unicode_literals
  import re
  
  import dataproperty
  
  from ._error import InvalidCharError
  
  
  __RE_SYMBOL = re.compile("[^a-zA-Z0-9]")
  
  
  def validate_symbol(text):
      """
      Raise an exception if symbol(s) included in ``text``.
  
      :param str text: Input text.
      :raises pathvalidate.InvalidCharError: If the ``text`` includes symbol(s)
      """
  
      match_list = __RE_SYMBOL.findall(text)
      if dataproperty.is_not_empty_sequence(match_list):
          raise InvalidCharError("invalid symbols found: {}".format(match_list))
  
  
  def replace_symbol(text, replacement_text=""):
      """
      Replace all of the symbols in text.
  
      :param str text: Input text.
      :param str replacement_text: Replacement text.
      :return: A replacement string.
      :rtype: str
      """
  
      return __RE_SYMBOL.sub(replacement_text, text)
  
new_contents: # encoding: utf-8
  
  """
  .. codeauthor:: Tsuyoshi Hombashi <gogogo.vm@gmail.com>
  """
  
  from __future__ import absolute_import
  from __future__ import unicode_literals
  import re
  
  import dataproperty
  
  from ._error import InvalidCharError
  
  
  __RE_SYMBOL = re.compile("[^a-zA-Z0-9]")
  
  
  def validate_symbol(text):
      """
      Raise an exception if symbol(s) included in the ``text``.
  
      :param str text: Input text.
      :raises pathvalidate.InvalidCharError: If the ``text`` includes symbol(s)
      """
  
      match_list = __RE_SYMBOL.findall(text)
      if dataproperty.is_not_empty_sequence(match_list):
          raise InvalidCharError("invalid symbols found: {}".format(match_list))
  
  
  def replace_symbol(text, replacement_text=""):
      """
      Replace all of the symbols in the ``text``.
  
      :param str text: Input text.
      :param str replacement_text: Replacement text.
      :return: A replacement string.
      :rtype: str
      """
  
      return __RE_SYMBOL.sub(replacement_text, text)
  
subject: Update docstring