Getting the message from defined in a Django RegexValidator object

Question

I defined a RegexValidator using Django's built-in class. Like as follows:

from django.core.validators import RegexValidator

validate_alphanumeric = RegexValidator(r'^[a-zA-Z0-9]*$', 'Only alphanumeric characters are allowed.')

The issue is that I am using this from outside of the model definition. Like as follows:

try:
    validate_alphanumeric("++")
except:
    # Somehow get the message defined above, that is get 'Only alphanumeric characters are allowed.'

In other words, if the string passed causes an error, I want to get the message stored in my RegexValidator object definition. How can I do this?

Alasdair · Accepted Answer · 2018-11-07 17:17:21Z

1

Catch the exception and use the message attribute of the validation error.

from django.core.exceptions import ValidationError

try:
    validate_alphanumeric("++")
except ValidationError as exc:
    message = exc.message

answered Nov 7, 2018 at 17:17

Alasdair

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