How to use the pathspec.util.register_pattern function in pathspec

	@staticmethod
	def escape(s):
		"""
		Escape special characters in the given string.

		*s* (:class:`unicode` or :class:`bytes`) a filename or a string
		that you want to escape, usually before adding it to a `.gitignore`

		Returns the escaped string (:class:`unicode`, :class:`bytes`)
		"""
		# Reference: https://git-scm.com/docs/gitignore#_pattern_format
		meta_characters = r"[]!*#?"

		return "".join("\\" + x if x in meta_characters else x for x in s)

util.register_pattern('gitwildmatch', GitWildMatchPattern)


class GitIgnorePattern(GitWildMatchPattern):
	"""
	The :class:`GitIgnorePattern` class is deprecated by :class:`GitWildMatchPattern`.
	This class only exists to maintain compatibility with v0.4.
	"""

	def __init__(self, *args, **kw):
		"""
		Warn about deprecation.
		"""
		self._deprecated()
		return super(GitIgnorePattern, self).__init__(*args, **kw)

	@staticmethod

"""
		Warn about deprecation.
		"""
		warnings.warn("GitIgnorePattern ('gitignore') is deprecated. Use GitWildMatchPattern ('gitwildmatch') instead.", DeprecationWarning, stacklevel=3)

	@classmethod
	def pattern_to_regex(cls, *args, **kw):
		"""
		Warn about deprecation.
		"""
		cls._deprecated()
		return super(GitIgnorePattern, cls).pattern_to_regex(*args, **kw)

# Register `GitIgnorePattern` as "gitignore" for backward compatibility
# with v0.4.
util.register_pattern('gitignore', GitIgnorePattern)