RegExp: Placas de carros colombianos. Colombian car plates validator.

plates.py

from django.core.validators import RegexValidator

plates_validator = RegexValidator(
    r'^([A-Z]{3}\d{3}|[A-Z]{2}\d{4}|[A-Z]{2}\d{3}[A-Z]|[A-Z]\d{4,5}|[A-Z]{3}\d{2}[A-Z])$',
    u'Combinaciones posibles: ABC123, AB1234, AB123C, A1234, A12345, ABC12D'
)

# http://www.regexr.com/391ai