Django - RegexValidator using special expressions

Question

How do I implement special expressions in RegexValidator ?

forms.py:

class MyRegistrationForm(forms.ModelForm):
    alphanumeric = RegexValidator('^[A-Za-z]+$', 'Only alphabetic')
    first_name = forms.CharField(max_length = 20, validators=[alphanumeric])
    last_name = forms.CharField(max_length = 20, validators=[alphanumeric])

I would like to use: áàäéèëíìïóòöúùüñÁÀÄÉÈËÍÌÏÓÒÖÚÙÜÑ as well but I get a "Non-ASCII character" error. Is there any other way to use it?

Answer 1

You can use the \\w specifier, but since RegexValidator does not enable the re.UNICODE flag, you might need something like this:

import re
class MyRegistrationForm(forms.ModelForm):
    re_alphanumeric = re.compile('^\w+$', re.UNICODE)
    alphanumeric = RegexValidator(re_alphanumeric, 'Only alphabetic')
    ...

Update: If you want to exclude numeric characters, use

import re
class MyRegistrationForm(forms.ModelForm):
    re_alpha = re.compile('[^\W\d_]+$', re.UNICODE)
    alpha = RegexValidator(re_alpha, 'Only alphabetic')
    ...