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格式为6个数字,短划线和两个数字.(###### - ##)

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 ######-##!")

它目前不允许我提交格式正确的capa并抛出ValidationError.我认为问题是我正在尝试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？

*********UPDATE

当我在CAPA字段中输入错误的格式时,现在一切正常.我收到错误The view incidents.views.index didn't return an HttpResponse object. It returned None instead.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,您需要一个正则表达式验证器: Django验证器/正则表达式验证器

然后,将其添加到您的字段的验证器列表中: 使用表单中的验证器

简单示例如下:

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]
    )