[Answered ]-Manipulating Django form to show the correct validation error(s)

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So instead of using the RegexField I would probably either go with a CharField and a customized clean-method for the field, which handles the whitespace issue first and only checks the regex if the the whitespace check passed.

Or I would use a CharField and assign a custom validator first, that checks for the whitespaces, and additionally a RegexValidator

Something along these lines:

from django.core.exceptions import ValidationError
from django.core.validators import RegexValidator

def validate_whitespaces(value):
    if ' ' in value:
        raise ValidationError("Oops, a whitespace error occured.")

username = forms.CharField(
    max_length=50,
    validators=[
        validate_whitespaces,
        RegexValidator(
            regex='^[\w.@+-]+$',
            message='Only use valid chars ...'
        )
    ]
)
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