python - Django 模型中域名的正则表达式匹配

Question

我有一张 table ，它看起来像:

class Tld(models.Model):
    domainNm = models.CharField(validators=[ RegexValidator('^[0-9]^[a-z]','yourdomain.com only','Invalid Entry')], max_length=40)
    dtCreated = models.DateField()

对于 domainNm - 我想验证任何看起来像这样的条目:

• domain.com
• 1domain.com
• domain1.com

它必须遵循这种方式:<domainname>.[com|biz|net]等等，并且是字母数字。

我如何在 Django 模型的模型级别执行此操作？

谢谢

Answer 1

如果您想验证 HTTP URL，请忘记正则表达式并使用 builtin validator .

如果您只想要没有任何协议(protocol)的域，请尝试:

def full_domain_validator(hostname):
    """
    Fully validates a domain name as compilant with the standard rules:
        - Composed of series of labels concatenated with dots, as are all domain names.
        - Each label must be between 1 and 63 characters long.
        - The entire hostname (including the delimiting dots) has a maximum of 255 characters.
        - Only characters 'a' through 'z' (in a case-insensitive manner), the digits '0' through '9'.
        - Labels can't start or end with a hyphen.
    """
    HOSTNAME_LABEL_PATTERN = re.compile("(?!-)[A-Z\d-]+(?<!-)$", re.IGNORECASE)
    if not hostname:
        return
    if len(hostname) > 255:
        raise ValidationError(_("The domain name cannot be composed of more than 255 characters."))
    if hostname[-1:] == ".":
        hostname = hostname[:-1]  # strip exactly one dot from the right, if present
    for label in hostname.split("."):
        if len(label) > 63:
            raise ValidationError(
                _("The label '%(label)s' is too long (maximum is 63 characters).") % {'label': label})
        if not HOSTNAME_LABEL_PATTERN.match(label):
            raise ValidationError(_("Unallowed characters in label '%(label)s'.") % {'label': label})

用法:

from django.core.validators import URLValidator

field = models.CharField(_('host name'), max_length=255, validators=[URLValidator])

或

field = models.CharField(_('host name'), max_length=255, validators=[full_domain_validator])