python 學習正則與文件讀寫從字符串裏面找出郵箱正則

原創

2020-02-22 06:07

這個是（Python核心編程）裏面的一個例子，修改了一下用文件來存取

# -*- coding: utf8 -*-
from random import randint,choice
from string import lowercase
from sys import maxint
from time import ctime
from os import path
from re import match,search
def createdata(path):
    doms = ('com','edu','net','org','gov')
    print path
    dataFile = open(path,'a')
    #打印隨機5到十條數據
    for i in range(randint(5,10)):
        dtint = randint(0,maxint-1)
        #print dtint
        dtstr = ctime(dtint)#將一個時間戳轉換爲時間的字符串，無參數則爲當前系統時間
        #print dtstr
        shorter = randint(4,7)
        #print shorter
        em = ''#@前面的部分
        for j in range(shorter):
            #常量string.lowercase包含了所有小寫的英文字母；常量string.uppercase包  
            #含了所有大寫的英文字母；常量string.digits包含了從0到9的數字
            em += choice(lowercase)#從序列中獲取一個隨機元素
            #print em
        longer = randint(shorter,12)
        dn = ''#@後面的部分
        for j in range(longer):
            dn +=choice(lowercase)
        dataFile.write('%s::%s@%s.%s::%d-%d-%d\n' % (dtstr,em,dn,choice(doms),dtint,shorter,longer))
if __name__ =='__main__':
    datapath = 'c://Users//xiaoyizong//Desktop//re_data_test'
    if(path.exists(datapath)):
        print '     now read data!!!!'
        with open('c://Users//xiaoyizong//Desktop//re_data_test') as re_data_test:
            datastr = re_data_test.readlines()
            
        #找出data裏面的所有郵箱，輸出
        patt = '[a-zA-Z](([a-zA-Z0-9]*\.[a-zA-Z0-9]*)|[a-zA-Z0-9]*)[a-zA-Z]@([a-z0-9A-Z]+\.)+[a-zA-Z]{2,}'
        
        for str in datastr:
            #print patt, str
            print search(patt,str).group()
    else:
        print '     data not exist and now create data'
        createdata(datapath)

生成的數據樣式：