python 正则表达式 过滤字符串两边的字符，类似strip功能 练习题

import re


def customerStrip(steament, string):
    '''
    :param steament: 被过滤的字符串
    :param string: 要过滤的字符
    :return: 返回过滤后的数据
    '''
    string = '\\' + string
    customerRegex = re.compile(r'^(((' + string + ')*)?(\s*))(.*?)((\s*)?((' + string + ')*))$')
    try:
        moCustome = customerRegex.search(steament).groups()
        return moCustome[4]
    except AttributeError:
        return '不存在要过滤的字符！'


text = '####3213213###'

print(customerStrip(text, '#'))

自己练习写的很不完善。
经测试，strip 这是这个自定义函数customerStrip的80多倍，很差劲，方法写的不好
import re

import time


def leftRegex(steament, string):
    lRgex = re.compile(r'(^(' + string + ')*)')
    moLeft = lRgex.search(steament).group()
    return moLeft


def rightRegex(steament, string):
    rRegex = re.compile(r'((' + string + ')*)$')
    moRight = rRegex.search(steament).group()
    return moRight


def customerStrip(steament, string, type='center'):
    '''
    :param steament: 
    :param string: 
    :param type: 
    :return: 
    '''
    if string.isspace():
        string = '\s'
    else:
        string = '\\' + string
    if type == 'right':
        right = rightRegex(steament, string)
        return  steament[:-len(right)]
    elif type == 'left':
        left=leftRegex(steament, string)
        return steament[len(left):]
    elif type == 'center':
        right = rightRegex(steament, string)
        left = leftRegex(steament, string)
        steament =steament[:-len(right)]
        steament=steament[len(left):]
        return steament


text = '##321333333333333354343243255442343241341324312414321####'




# customer time
start = time.time()
print(customerStrip(text, '#'))
end = time.time()

time1 = end - start
# strip time
start1 = time.time()
print(text.strip('#'))
ends = time.time()
time2 = ends - start1
print(time1/time2)

此函数经测试，strip 是他的40-50倍，比上面那个提高了不少，依然很差劲

import re

import time


def customerStrip(steament, string):
    if string.isspace():
        string = '\s'
    else:
        string = '\\' + string
    centerRegex = re.compile(r'(^(' + string + ')*)?(.*?)((' + string + ')*)?$')
    result = centerRegex.search(steament).groups()[2]
    return result

和上面的差不多速度