How to use the pathspec.pattern.RegexPattern function in pathspec

files.
"""
from __future__ import unicode_literals

import re
import warnings

from .. import util
from ..compat import unicode
from ..pattern import RegexPattern

#: The encoding to use when parsing a byte string pattern.
_BYTES_ENCODING = 'latin1'


class GitWildMatchPattern(RegexPattern):
	"""
	The :class:`GitWildMatchPattern` class represents a compiled Git
	wildmatch pattern.
	"""

	# Keep the dict-less class hierarchy.
	__slots__ = ()

	@classmethod
	def pattern_to_regex(cls, pattern):
		"""
		Convert the pattern into a regular expression.

		*pattern* (:class:`unicode` or :class:`bytes`) is the pattern to
		convert into a regular expression.

regex = re.compile(regex)

		elif pattern is not None and hasattr(pattern, 'match'):
			# Assume pattern is a precompiled regular expression.
			# - NOTE: Used specified *include*.
			regex = pattern

		elif pattern is None:
			# NOTE: Make sure to allow a null pattern to be passed for a
			# null-operation.
			assert include is None, "include:{!r} must be null when pattern:{!r} is null.".format(include, pattern)

		else:
			raise TypeError("pattern:{!r} is not a string, RegexObject, or None.".format(pattern))

		super(RegexPattern, self).__init__(include)
		self.regex = regex

def __eq__(self, other):
		"""
		Tests the equality of this regex pattern with *other* (:class:`RegexPattern`)
		by comparing their :attr:`~Pattern.include` and :attr:`~RegexPattern.regex`
		attributes.
		"""
		if isinstance(other, RegexPattern):
			return self.include == other.include and self.regex == other.regex
		else:
			return NotImplemented