docs: def from_string_pairs(cls, string_value_pairs, **kwargs):
          """Build an :class:`~.REMap` from str, value pairs by applying
          `re.compile` to each string and calling the __init__ of :class:`~.REMap`
          """
          return cls(re_value_pairs=[(re.compile(s), v)
                                     for s, v in string_value_pairs],
                     **kwargs)