IIS RewriteRules - iis

Question

I have a RewriteRule that prepends "www" to the URL, granted that it does not already exist.
<rule name="Add www" patternSyntax="Wildcard" stopProcessing="true">
<match url="*" />
<conditions>
<add input="{HTTP_HOST}" pattern="www.example.com" negate="true" />
</conditions>
<action type="Redirect" url="http://www.example.com/{R:1}" redirectType="Permanent" />
</rule>
The trouble is, I have another inbound domain (www.example2.com) for which I do not want this rewrite rule to apply. I would think that the following would work fine.
<rule name="Add www" patternSyntax="Wildcard" stopProcessing="true">
<match url="*" />
<conditions logicalGrouping="MatchAll">
<add input="{HTTP_HOST}" pattern="www.example.com" negate="true" />
<add input="{HTTP_HOST}" pattern="www.example2.com" negate="true" />
</conditions>
<action type="Redirect" url="http://www.example.com/{R:1}" redirectType="Permanent" />
</rule>
But it just seems to be ignored. Any suggestions? Thanks!

Answer 1

You can do it with this rule. It will add www, only for domain example.com and will ignore all other domains:
<rule name="Add www" patternSyntax="Wildcard" stopProcessing="true">
<match url="*" />
<conditions>
<add input="{HTTP_HOST}" pattern="^example.com$" />
</conditions>
<action type="Redirect" url="http://www.example.com/{R:1}" redirectType="Permanent" />
</rule>

Answer 2

Victor got me most of the way there. Thanks!
<rule name="Add www" stopProcessing="true">
<match url=".*" />
<conditions>
<add input="{HTTP_HOST}" pattern="^example.com$" />
</conditions>
<action type="Redirect" url="http://www.example.com/{R:0}" redirectType="Permanent" />
</rule>
patternSyntax has to be the default regular expression value. That means the URL pattern had to be altered, and the backtrack expression is zero-based.