CODEWITHSUNDEEP
pythonregexflask-wtforms
Diogo
Diogo

Reputation: 1

How to fix (regex password) error in python?

I am setting up my server and I want to have the passwords with complexity.

Using a regex in Python, how can I verify that a user's password is:

At least 8 characters

Must be restricted to, though does not specifically require any of:

uppercase letters: A-Z

lowercase letters: a-z

numbers: 0-9

any of the special characters: @#$%^&+=

import re

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

if re.match(r'[A-Za-z0-9@#$%^&+=]{8,}', password):

    # match
else:

    # no match

from wtforms import StringField, PasswordField, SubmitField, BooleanField

from wtforms.validators import DataRequired, Length, Email, EqualTo, ValidationError


class RegistrationForm(FlaskForm):

    username = StringField('Username',
                           validators=[DataRequired(), Length(min=2, max=20)])
    email = StringField('Email',
                        validators=[DataRequired(), Email()])
    #password = 
    pattern = "^.*(?=.{8,})(?=.*\d)(?=.*[a-z])(?=.*[A-Z])(?=.*[@#$%^&+=]).*$"
    password = PasswordField('Password', validators=[DataRequired(), Length(min=2, max=20)])
    if re.match(r'[A-Za-z0-9@#$%^&+=]{8,}', password):
        print ("Valid password")
    else:
        print ("Password not valid")

I expect the output to be valid or invalid password

Upvotes: 0

Views: 441

Answers (1)

gmds
gmds

Reputation: 19885

A regex seems a bit heavy to me. You can just use normal string operations:

from string import ascii_lowercase, digits

punctuation = '@#$%^&+='
valid_characters = ascii_lowercase + digits + punctuation

def validate_password(password):
    return len(password) >= 8 and set(password) <= set(valid_characters)

Upvotes: 2

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