python regex

#python

1.check valid

import re

def main():
    username = input('please input username:')
    qq = input('please input qq:')

    m1 = re.match(r'^[0-9a-zA-Z_]{6,20}$', username)
    if not m1:
        print('please input valid username')

    m2 = re.match(r'^[1-9]\d{4,11}$', qq)
    if not m2:
        print('please input valid qq')

    if m1 and m2:
        print('input is valid')

if __name__ == '__main__':
    main()

2. find phone number

import re


def main():
    pattern = re.compile(r'(?<=\D)1[34578]\d{9}(?=\D)')
    sentence = 'my phone is 13056248933 not 15625486587.'

    # find all
    mylist = re.findall(pattern, sentence)
    print(mylist)

    print('----------------')
    # find by iterate
    for temp in pattern.finditer(sentence):
        print(temp.group())

    print('----------------')
    # find by search
    m = pattern.search(sentence)
    while m:
        print(m.group())
        m = pattern.search(sentence, m.end())


if __name__ == '__main__':
    main()

3.replace dirty words

import re


def main():
    sentence = 'fuck you, thank you'
    purified = re.sub('fuck|shit', '*', sentence, flags=re.IGNORECASE)
    print(purified)


if __name__ == '__main__':
    main()

4.split sentence

import re


def main():
    poem = 'Hello, my name is xxx. nice to need you'
    sentence_list = re.split(r'[，。, .]', poem)
    while '' in sentence_list:
        sentence_list.remove('')
    print(sentence_list)


if __name__ == '__main__':
    main()