strip()的正则表达式函数写法

import re

def stripRegex(text, stre=None):
    stripRegex = re.compile(r'(\s)?(.*)(\s)?') 
    mo = stripRegex.search(str(text))
    num1, num2, num3 = mo.groups()
    if stre == None:
        del num1
        del num3
        print(num2)
    elif stre in list(str(text)):
        molist = list(str(text))
        textmo = ''.join(molist).split(stre) 
        motext = ''.join(textmo)
        print(motext)
    else:
        print('替換的值不在這個字符串')

stripRegex(123456879, stre='3')

欢迎大家多多指点...