regex - Django:使用正则表达式检查表单中的 CharField 格式

Question

class CapaForm(forms.Form):
    capa = forms.CharField(required=False)

提交表单后，我想检查 capa 字段的格式。我想要求用户正确输入 capa 格式，包括 6 个数字、一个破折号和两个数字。 (######-##)

def search(self):
    capa = self.cleaned_data.get('capa', None)

    if ("\d{6}\-\d{2}" or None) not in capa:
            raise forms.ValidationError("CAPA format needs to be ######-##!")

目前不允许我提交格式正确的 capa 并抛出 ValidationError。我认为问题是我试图将正则表达式与对象进行比较。如何检查用户尝试提交的“capa”的格式？

************更新

现在一切正常，除了当我在 CAPA 字段中输入错误的格式时。我收到错误 View events.views.index 没有返回 HttpResponse 对象。它返回 None 。这与我所做的更改有关吗？

from django.core.validators import RegexValidator
my_validator = RegexValidator("\d{6}\-\d{2}", "CAPA format needs to be ######-##.")

class CapaForm(forms.Form):
    capa = forms.CharField(
        label="CAPA",
        required=False, # Note: validators are not run against empty fields
        validators=[my_validator]
        )

def search(self):
    capa = self.cleaned_data.get('capa', None)
    query = Incident.objects.all()
    if capa is not '':
            query = query.filter(capa=capa)
    return(query)

Answer 1

首先你需要一个正则表达式验证器: Django validators / regex validator

然后，将其添加到您的字段的验证器列表中: using validators in forms

下面是简单的例子:

from django.core.validators import RegexValidator
my_validator = RegexValidator(r"A", "Your string should contain letter A in it.")

class MyForm(forms.Form):

    subject = forms.CharField(
        label="Test field",
        required=True,  # Note: validators are not run against empty fields
        validators=[my_validator]
    )