Passing multiple regular expression parameters from a URL to the view definition in Django

I have the following model called LodgingOffer, through which it is possible to create a lodging offer and detail its data:

class LodgingOffer(models.Model):

    # Foreign Key to my User model      
    created_by = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)

    ad_title = models.CharField(null=False, blank=False,
        max_length=255, verbose_name='Título de la oferta')

    slug = models.SlugField(max_length=100, blank=True)

    country = CountryField(blank_label='(Seleccionar país)', verbose_name='Pais')

    city = models.CharField(max_length=255, blank = False, verbose_name='Ciudad')

    def __str__(self):
        return "%s" % self.ad_title

    pub_date = models.DateTimeField(auto_now_add=True,)

    def get_absolute_url(self):
        return reverse('host:detail', kwargs = {'slug' : self.slug })

# I assign slug to offer based in ad_title field,checking if slug exist
def create_slug(instance, new_slug=None):
    slug = slugify(instance.ad_title)
    if new_slug is not None:
        slug = new_slug
    qs = LodgingOffer.objects.filter(slug=slug).order_by("-id")
    exists = qs.exists()
    if exists:
        new_slug = "%s-%s" % (slug, qs.first().id)
        return create_slug(instance, new_slug=new_slug)
    return slug

# Brefore to save, assign slug to offer created above.
def pre_save_article_receiver(sender, instance, *args, **kwargs):
    if not instance.slug:
        instance.slug = create_slug(instance)

pre_save.connect(pre_save_article_receiver, sender=LodgingOffer)

For this model, I have a detail view called HostingOfferDetailViewin which I show the data of an offer of an objectLodgingOffer

An important objective that I want to pursue and for which I ask this question is that in the detail view of an object LodgingOfferI must be able to contact the owner of that offer (object LodgingOffer- user who created it-) so that another interested user can apply to it .

For this purpose, I have the function contact_owner_offer()which is a function where I send an email to the owner of this offer.

I am doing all this in the detail view HostingOfferDetailViewin this way:

class HostingOfferDetailView(UserProfileDataMixin, LoginRequiredMixin, DetailView):
    model = LodgingOffer
    template_name = 'lodgingoffer_detail.html'
    context_object_name = 'lodgingofferdetail'

    def get_context_data(self, **kwargs):
        context = super(HostingOfferDetailView, self).get_context_data(**kwargs)
        user = self.request.user

        # LodgingOffer object
        #lodging_offer_owner = self.get_object()

        # Get the full name of the lodging offer owner        
        lodging_offer_owner_full_name = self.get_object().created_by.get_long_name()

        # Get the lodging offer email owner
        lodging_offer_owner_email = self.get_object().created_by.email

        # Get the lodging offer title
        lodging_offer_title = self.get_object().ad_title

        # Get the user interested email in lodging offer
        user_interested_email = user.email

        # Get the user interested full name 
        user_interested_full_name = user.get_long_name()

        context['user_interested_email'] = user_interested_email
        context['lodging_offer_owner_email'] = lodging_offer_owner_email

        # Send the data (lodging_offer_owner_email
        # user_interested_email and lodging_offer_title) presented 
        # above to the contact_owner_offer function
        contact_owner_offer(self.request, lodging_offer_owner_email,
                    user_interested_email, lodging_offer_title)

        return context

My function contact_owner_offerreceives these offer parameters and sends the email to the owner of the offer or who published it, as follows:

def contact_owner_offer(request, lodging_offer_owner_email, user_interested_email, lodging_offer_title):
    user = request.user
    print("a", lodging_offer_owner_email, user_interested_email)
    if user.is_authenticated:
        print('Send email')
        mail_subject = 'Interesados en tu oferta'

        context = {
            'lodging_offer_owner_email': lodging_offer_owner_email,
            # usuario dueño de la oferta  TO

            'offer': lodging_offer_title,
            # oferta por la que se pregunta

            'user_interested_email': user_interested_email,
            # usuario interesado en la oferta

            'domain': settings.SITE_URL,
            'request': request
        }

        message = render_to_string('contact_user_own_offer.html', context)
        #to_email = lodging_offer_owner.email,

        send_mail(mail_subject, message, settings.DEFAULT_FROM_EMAIL,
              [lodging_offer_owner_email], fail_silently=True)

        # email = EmailMessage(mail_subject, message, to=[to_email])
        # email.send()
    # return redirect('articles:article_list')

I have done this as a test and so far everything is as I wanted, and the result is that when I enter the detail URL of an object offer LodgingOffer, an email is sent to the owner of said offer.

What I want is that in my offer detail template, to have a button which says "Contact the owner of the offer" and that any user who presses it, immediately sends an email to the owner of the offer.

For this, I have proceeded to define a URL that calls the function contact_owner_offer()and that is called from the attribute hrefof a button in my template:

The URL, ( according to my understanding and this is where the doubt lies and the reason for my question ) I have defined according to the number of parameters that the function receivescontact_owner_offer()

This means that my URL should receive:

• The offer owner's email
• The email of the user interested in the offer
• The title of the offer, although for this I am sending you the slug of that title, I do not know if that is correct

So, according to the above, I have created this URL:

url(r'^contact-to-owner/(?P<email>[\w.@+-]+)/from/'
    r'(?P<interested_email>[\w.@+-]+)/(?P<slug>[\w-]+)/$',
    contact_owner_offer, name='contact_owner_offer'),

Next, in my template, I generate an html button where I call this URL by sending its respective parameters:

<div class="contact">
    <a class="contact-button" href="{% url 'host:contact_owner_offer' email=lodging_offer_owner_email interested_email=user_interested_email slug=lodgingofferdetail.slug %}">
        <img src="{% static 'img/icons/contact.svg' %}" alt="">
        <span>Contactar</span>
    </a>
</div>

What happens to me is that when I enter the offer detail template and click on the Contact button referring immediately above, I get the following error message:

TypeError: contact_owner_offer() got an unexpected keyword argument 'email'
[10/Oct/2017 01:04:06] "GET /host/contact-to-owner/[email protected]/from/[email protected]/apartacho/ HTTP/1.1" 500 77979

What I don't understand is because it tells me that my URL doesn't expect a called argument email, which is where I pass the parameter email=lodging_offer_owner_emailthrough the button in the template.

I appreciate any guidance

UPDATE

According to the given recommendations I have slightly changed the definition of my URL specifying the name of the argument or keyword argument that I am passing.

My function is:

def contact_owner_offer(request, lodging_offer_owner_email, user_interested_email, slug):
    user = request.user
    print("a", lodging_offer_owner_email, user_interested_email, slug)
    if user.is_authenticated:
        print('Send email')
        mail_subject = 'Interesados en tu oferta'

        context = {
            'lodging_offer_owner_email': lodging_offer_owner_email,
            # usuario dueño de la oferta  TO

            'offer': slug,
            # oferta por la que se pregunta

            'user_interested_email': user_interested_email,
            # usuario interesado en la oferta

            'domain': settings.SITE_URL,
            'request': request
        }

        message = render_to_string('contact_user_own_offer.html', context)
        #to_email = lodging_offer_owner.email,

        send_mail(mail_subject, message, settings.DEFAULT_FROM_EMAIL,
                  [lodging_offer_owner_email], fail_silently=True)

The definition of my URL has been like this:

url(r'^contact-to-owner/(?P<lodging_offer_owner_email>[\w.@+-]+)/from/'
    r'(?P<interested_email>[\w.@+-]+)/(?P<slug>[\w-]+)/$',
    contact_owner_offer,
    name='contact_owner_offer'
),

In my html template it has been like this, the value of the slug parameter, I take it through the context_object_name that I define in the class HostingOfferDetailView, so it remains lodgingofferdetail.slug:

<div class="contact">
    <a class="contact-button" href="{% url 'host:contact_owner_offer' lodging_offer_owner_email=lodging_offer_owner_email interested_email=user_interested_email slug=lodgingofferdetail.slug %}">
        <img src="{% static 'img/icons/contact.svg' %}" alt="">
        <span>Contactar</span>
    </a>
</div>

And when I position myself on the button I get in the url the value of the parameters that I am handling

Only when I click that button, I get the same error again:

Traceback:

File "/home/bgarcial/.virtualenvs/hostayni/lib/python3.6/site-packages/django/core/handlers/exception.py" in inner
  42.             response = get_response(request)

File "/home/bgarcial/.virtualenvs/hostayni/lib/python3.6/site-packages/django/core/handlers/base.py" in _get_response
  187.                 response = self.process_exception_by_middleware(e, request)

File "/home/bgarcial/.virtualenvs/hostayni/lib/python3.6/site-packages/django/core/handlers/base.py" in _get_response
  185.                 response = wrapped_callback(request, *callback_args, **callback_kwargs)

Exception Type: TypeError at /host/contact-to-owner/[email protected]/from/[email protected]/apartacho/
Exception Value: contact_owner_offer() got an unexpected keyword argument 'interested_email'