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You could write the rule to ensure their are three parts.<br />
i.e., start with <b>^([a-zA-Z0-9]+)\.([a-zA-Z0<wbr />-9]+)$</b> to do your redirect to www<br />
then do the remaining rules after
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You could write the rule to ensure their are three parts.
i.e., start with ^([a-zA-Z0-9]+)\.([a-zA-Z0-9]+)$ to do your redirect to www
then do the remaining rules after

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Currently in IIS, I have 3 URL Rewrite rules:<br />
1. &nbsp;Redirect http to https<br />
2. &nbsp;If they forget to put in the www in front of the domain name they are redirected to the correct site<br />
(This is what I used: &nbsp;doesn't match pattern &nbsp;^www\.([.a-zA-Z0-9]+)$)<br />
3. &nbsp;If they come in using www1 (which still exists), they are redirected to another URL<br />
<br />
Now, they want to start using subdomains (example: &nbsp;clientname.domain.com)<br />
What currently happens is rule #2 puts a www in front of the name because it doesn't have www. &nbsp;<br />
We have a lot of clients and they want a subdomain for each one.<br />
<br />
Any ideas on how to accomplish this?
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Currently in IIS, I have 3 URL Rewrite rules:
1.  Redirect http to https
2.  If they forget to put in the www in front of the domain name they are redirected to the correct site
(This is what I used:  doesn't match pattern  ^www\.([.a-zA-Z0-9]+)$)
3.  If they come in using www1 (which still exists), they are redirected to another URL

Now, they want to start using subdomains (example:  clientname.domain.com)
What currently happens is rule #2 puts a www in front of the name because it doesn't have www.  
We have a lot of clients and they want a subdomain for each one.

Any ideas on how to accomplish this?

IIS URL Rewrite Rules question

IIS is Internet Information Services, the web server included with Windows Server operating systems. All current versions are built on a modular architecture; modules can be added or removed individually so that those required for specific functionality are installed. The full installation of IIS includes HTTP, security, content, compression, caching, logging and diagnostics.