from django.core.validators import RegexValidator


AlphanumericValidator = RegexValidator(r'^[0-9a-zA-Z]*$', 'Only latin characters (A-Z, a-z)'
                                                          ' and digits (0-9) are allowed.')
LowerAlphanumericValidator = RegexValidator(r'^[0-9a-z]*$', 'Only lower case latin characters (a-z)'
                                                            ' and digits (0-9) are allowed.')
IdStringValidator = RegexValidator(r'^[0-9a-z_.-]*$', 'Only lower case latin characters (a-z),'
                                                      ' digits (0-9),'
                                                      ' dots (.), underscores (_) and hyphens (-) are allowed.')