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_btn_add_fuzzing_values_clicked(self):
        if self.ui.comboBoxStrategy.currentIndex() == 0:
            self.__add_fuzzing_range()
        elif self.ui.comboBoxStrategy.currentIndex() == 1:
            self.__add_fuzzing_boundaries()
        elif self.ui.comboBoxStrategy.currentIndex() == 2:
            self.__add_random_fuzzing_values()