Question

我的密码要求是：

至少10个符号
至少一位数
至少一个大写字母
至少一个小写字母
仅限字母或数字

所以我想使用re模块来检查我的字符串输入：re.search(pattern, string)。

我的模式应该是什么？

Answer 1

是的，你可以通过正则表达式做到这一点。

^(?=.*?\d)(?=.*?[A-Z])(?=.*?[a-z])[A-Za-z\d]{10,}$

DEMO

>>> import re
>>> m = re.compile(r'^(?=.*?\d)(?=.*?[A-Z])(?=.*?[a-z])[A-Za-z\d]{10,}$')
>>> m.match('43543fooR')
>>> m.match('43543fooRy')
<_sre.SRE_Match object; span=(0, 10), match='43543fooRy'>
>>> m.match('foobar7678A')
<_sre.SRE_Match object; span=(0, 11), match='foobar7678A'>
>>> m.match('foobar76(')
>>> m.match('fokhjf7645464644sresrtf')
>>> m.match('fokhjf764546M4644sresrtf')
<_sre.SRE_Match object; span=(0, 24), match='fokhjf764546M4644sresrtf'>
>>>

(?=.*?\d)检查至少一位数
(?=.*?[A-Z])至少一个上层。
(?=.*?[a-z])至少一个小写。
[A-Za-z\d]{10,}匹配大写或小写或数字字符10次或更多次。这可确保匹配必须至少包含10个字符。

Answer 2

while True:
    passw = input("password: ")
    if len(passw)<10:
        print ("not enough")
        continue
    if passw.isalpha():
        print ("atleast 1 digit")
        continue
    if passw.islower():
        print ("at least 1 uppercase")
        continue
    if pass.isupper():
        print ("Do you even password?")
        continue
    else:
        print ("Finally, you created a password that FBI using.")

输出;

>>> 
password: a
not enough
password: asdasdasdasdasdadsadsadsads
atleast 1 digit
password: asdasdasdasdasdasdasdasdads1111
at least 1 uppercase
password: asASasdasdasdasdasdas111
Finally, you created a password that FBI using.
password:

使用if语句，首先检查长度。然后检查是否有isalpha()的任何数字。然后检查是否有islower()的大写字母。您不需要regex。

Answer 3

这是一篇类似的文章，回答了您的大部分问题How to test a regex password in Python?

您可能还会发现正则表达式食谱有用https://www.safaribooksonline.com/library/view/regular-expressions-cookbook/9781449327453/ch04s19.html

现场演示：https://ideone.com/4PGlTu

import re

password = raw_input("Enter string to test: ")

atLeastTenCharacters = ".{10,}"
hasAtLeastTenCharacters = re.findall(atLeastTenCharacters, password)
if (not hasAtLeastTenCharacters):
    print "Password should be at least 10 characters long!"

atLeastOneDigit = "[0-9]"
hasAtLeastOneDigit = re.findall(atLeastOneDigit, password)
if (not hasAtLeastOneDigit):
    print "Password should have at least one digit!"

atLeastOneUpper = "[A-Z]"
hasAtLeastOneUpper = re.findall(atLeastOneUpper, password)
if (not hasAtLeastOneUpper):
    print "Password should have at least one upper case character!"

atLeastOneLower = "[a-z]"
hasAtLeastOneLower = re.findall(atLeastOneLower, password)
if (not hasAtLeastOneLower):
    print "Password should have at least one lower case character!"

specialCharacters = "[^A-Za-z0-9]"
hasSpecialCharacters = re.findall(specialCharacters, password)
if (hasSpecialCharacters):
    print "Password should NOT have special characters!"

if (hasAtLeastTenCharacters and hasAtLeastOneDigit and hasAtLeastOneUpper and hasAtLeastOneLower and (not hasSpecialCharacters)):
    print "\nValid password"
else:
    print "\nPassword not valid"

匹配密码与Python正则表达式

3 个答案: