code: def _generate_choice_re(
      choices: Iterable[str], flags: Union[int, re.RegexFlag] = 0
  ) -> Pattern[str]:
      return re.compile(r"({})".format("|".join(choices)), flags=flags)
  
imports: import re
  import sys
  from datetime import datetime, timedelta
  from datetime import tzinfo
  from functools import lru_cache
  from typing import Any, ClassVar, Dict, Iterable, List, Match, Optional, Pattern, SupportsFloat, SupportsInt, Tuple, Union, cast, overload
  from dateutil import tz
  from arrow import locales
  from arrow.constants import DEFAULT_LOCALE
  from arrow.util import next_weekday, normalize_timestamp
label_desc: Use image node_id 13 for calling the DateTimeParser obj's underlying member method code with example usage: obj._generate_choice_re(choices, flags) and returns: re