from django.core.validators import RegexValidator


AlphanumericValidator = RegexValidator(r'^[0-9a-zA-Z]*$', 'Only characters A-Z, a-z and digits 0-9 are allowed.')
LowerAlphanumericValidator = RegexValidator(r'^[0-9a-z]*$', 'Only characters a-z and digits 0-9 are allowed.')