Redirect to HTTPS and WWW

[CarlosTorrecillas]

I have to virtual hosts: mysite.com and www.mysite.com and I would like to configure the template to perform at max. just one redirect so that I end up in https://www.mysite.com

Looking at templating I cannot find the way of determine whether the $host variable starts with www. or not in order to apply one or other rule. I wonder if there is any kind of function such as contains, intersect or something similar that allows me to achieve what I want.

Thanks