Url Rewrite - Web.config - HTTPS and www

Question

I need to be able to redirect to HTTPS (currently working) AND www (if it's not in the URL already).

If the URL does NOT have the www , then it works fine. However, when the URL DOES have www , it redirects and adds an additional www , such as https://www.www.domain.com

Note that I do not want to hard code the domain, and would like to use HTTPHOST or something equivalent.

Current rewrite rules:

    <rule name="Redirect to HTTPS" stopProcessing="true">
      <match url="(.*)" />
      <conditions>
        <add input="{HTTPS}" pattern="^OFF$" />
      </conditions>
      <action type="Redirect" url="https://www.{HTTP_HOST}/{R:1}" redirectType="Permanent" />
    </rule>
    <rule name="WWW Rewrite" enabled="true">
      <match url="(.*)" />
      <conditions>
        <add input="{HTTP_HOST}" negate="true" pattern="^www\.([.a-zA-Z0-9]+)$" />
      </conditions>
      <action type="Redirect" url="https://www.{HTTP_HOST}/{R:0}" appendQueryString="true" redirectType="Permanent" />
    </rule>

Answer 1

Ended up with this Regex - ^((?!www).)*[a-zA-Z0-9]+$

I also had to go into IIS and change "Does not match the pattern" to "Matches the pattern"

    <rule name="Redirect to HTTPS" stopProcessing="true">
      <match url="(.*)" />
      <conditions>
        <add input="{HTTPS}" pattern="^OFF$" />
      </conditions>
      <action type="Redirect" url="https://{HTTP_HOST}/{R:1}" redirectType="Permanent" />
    </rule>
    <rule name="WWW Rewrite" enabled="true" stopProcessing="true">
      <match url="(.*)" />
      <conditions logicalGrouping="MatchAny">
        <add input="{HTTP_HOST}" pattern="^((?!www).)*[a-zA-Z0-9]+$" />
      </conditions>
      <action type="Redirect" url="https://www.{HTTP_HOST}/{R:0}" appendQueryString="true" redirectType="Permanent" />
    </rule>