python判断用户注册中用户名是否包含非法字符

class UserRegisterForm(ModelForm):

    role = forms.IntegerField()

    check_password = forms.CharField(required=True)  # 用户的密码验证

    def clean(self):

        cleaned_data = super(UserRegisterForm, self).clean()

        #  检查用户的唯一性

        if 'username' in cleaned_data:

            username = cleaned_data['username']

            if User.objects.filter(username=username).count() > 0:

                msg = u"此用户已被注册!!。"

                self._errors["username"] = self.error_class([msg])

                del cleaned_data["username"]

            if not re.search(u'^[_a-zA-Z0-9\u4e00-\u9fa5]+$', username):

                msg = u"用户名不可以包含非法字符(!,@,#,$,%...)"

                self._errors['username'] = self.error_class([msg])

                del cleaned_data['username']

        # if "username" in cleaned_data:

        #     user_name = cleaned_data['username']

        #

        #     # 判断用户名是否包含非法字符

        #     if not re.search(u'^[_a-zA-Z0-9\u4e00-\u9fa5]+$', user_name):

        #         msg = u"用户名包含了非法字符"

        #         self._errors['user_name'] = self.error_class([msg])

        #         del cleaned_data['username']

        if 'password' in cleaned_data and 'check_password' in cleaned_data:

            password = cleaned_data['password']

            check_password = cleaned_data['check_password']

            if len(password) < 6 or len(check_password) < 6:

                msg = u'密码太简单!(建议密码长度为6-18位!)'

                self._errors['password'] = self.error_class([msg])

                self._errors['check_password'] = self.error_class([msg])

                del cleaned_data['password']

                del cleaned_data['check_password']

        if 'password' in cleaned_data and 'check_password' in cleaned_data:

            password = cleaned_data['password']

            check_password = cleaned_data['check_password']

            if password != check_password:

                msg = u'两次输入的密码不配配!'

                self._errors['password'] = self.error_class([msg])

                self._errors['check_password'] = self.error_class([msg])

                del cleaned_data['password']

                del cleaned_data['check_password']

        if 'password' in cleaned_data and 'check_password' in cleaned_data:

            password = cleaned_data['password']

            check_password = cleaned_data['check_password']

            if password is u'' or check_password is u'':

                msg = u'密码不可以为空!'

                self._errors['password'] = self.error_class([msg])

                self._errors['check_password'] = self.error_class([msg])

                del cleaned_data['password']

                del cleaned_data['check_password']

        if 'mobile' in cleaned_data:

            mobile = cleaned_data['mobile']

            if mobile.isdigit():

                if len(mobile) != 11:

                    msg = u"请输入正确的手机号码！例如：15925087562"

                    self._errors['mobile'] = self.error_class([msg])

                    del cleaned_data['mobile']

        # 用户注册邮箱验证试用Django的认证方式

        # if 'email' in cleaned_data:

        #     email = cleaned_data['email']

        #     if len(email) > 7:

        #         if re.match("^.+\\@(\\[?)[a-zA-Z0-9\\-\\.]+\\.([a-zA-Z]{2,3}|[0-9]{1,3})(\\]?)$", email) == None:

        #             msg = u"请输入正确的邮箱地址,例如：xxxxxx@163.com"

        #             self._errors = self.error_class([msg])

        #

        #             del cleaned_data['email']

        return cleaned_data

    def __init__(self, *args, **kwargs):

        super(UserRegisterForm, self).__init__(*args, **kwargs)

    class Meta:

        model = User

        fields = ('username', 'password', 'full_name', 'email', 'mobile')

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