CODEWITHSUNDEEP
regexdjangounicodedjango-forms
Hassan Baig
Hassan Baig

Reputation: 15814

Regexfield insufficient to validate text input (Django form)

In a Django form, users set their usernames. The username field in the form is defined like so:

    username = forms.RegexField(max_length=50,regex=r'^[\w.@ +-]+$',
            help_text=_("Required. 50 characters or fewer. Letters, digits and "
                          "@/./+/-/_ only."),
            error_messages={
                'invalid': _("This value may contain only letters, numbers and "
                             "@/./+/-/_ characters.")})

Validation occurs when the regular expression is matched, otherwise not. For instance, setting the username Bender* is invalid, whereby Bender@ is valid.

I've noticed that my form throws a nasty error if the user enters arabic or persian text, instead of elegantly invalidating it. E.g. if one tries العربی as the username, the following is thrown:

UnicodeEncodeError at /keep_username/

'ascii' codec can't encode characters in position 0-5: ordinal not in range(128)

Why doesn't this piece of text invalidate like normally (and What can I do to fix this)?

Thanks in advance!

Upvotes: 2

Views: 1197

Answers (2)

binpy
binpy

Reputation: 4194

You also can handle it with RegexValidator

for the forms.py

from django import forms
from django.core.validators import RegexValidator


class FooBar(forms.Form):
    username_validator = RegexValidator(r'^[\w.@ +-]+$', 
                                        "This value may contain only letters, "
                                        "numbers and @/./+/-/_ characters
    username = forms.CharField(validators=[username_validator])

or inside your models.py

from django.db import models
from django.core.validators import RegexValidator


class FooBar(models.Model):
    username_validator = RegexValidator(r'^[\w.@ +-]+$', 
                                        "This value may contain only letters, "
                                        "numbers and @/./+/-/_ characters
    username = models.CharField(max_length=200, validators=[username_validator])

Upvotes: 1

e4c5
e4c5

Reputation: 53734

RegexField can take a complied regular expression as well as a string. Shall we try it this way?

import re

regex = re.compile('^[\w.@ +-]+$',re.UNICODE)

class Myclass(models.Model):

     username = forms.RegexField(max_length=50,regex=regex,
            help_text=_("Required. 50 characters or fewer. Letters, digits and "
                          "@/./+/-/_ only."),

Upvotes: 3

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