def coerce(cls, string):
        """Create a :class:`Requirement` object from a given package spec."""
        match = re.match(cls.spec_regex, string)
        if not match:
            raise InvalidRequirementSpecError("could not parse requirement")
        package = match.group(1)
        if all(match.group(2, 3)):
            version = "".join(match.group(2, 3))
        else:
            version = None
        return cls(package, version)
def on_fuzzing_end_changed(self, value: int):
        self.ui.spinBoxFuzzingStart.setMaximum(self.ui.spinBoxFuzzingEnd.value())
        new_end = self.message.convert_index(value - 1, self.proto_view, 0, False)[1] + 1
        self.current_label.end = new_end
        self.current_label.fuzz_values[:] = []
        self.update_message_data_string()
        self.fuzz_table_model.update()
        self.ui.tblFuzzingValues.resize_me()