How to write a Step Pattern in Class definition in radish-bdd for a given regular expresssion?

I have written a Step pattern directly in the python without class definition. But i want to write for class with regular expression?

It is given the pattern must be in the doc string so i tried giving the regular expression but it didn't work.

With out Class definition

@given(re.compile(r"I have the scripts (.*) hello"))
def step_impl(step,number):
    """
    :type context behave.runner.Context
    """
    print("Number",number)

With Class definition i have tried like

from radish import steps, given
import re


@steps
class Calculator:

    def have_number(self, step, number):
        """@given(re.compile(r"I have the scripts (.*) hello"))"""
        print("HELLO",number)
        print("KHJH")

But it is not working.

I want a method from which i can accept the regular expression in the class based definition