Rewrite maps in IIS7 — how to make the match optionally include a trailing slash?

Question

I have read the top 30 Google hits for several combinations of IIS rewrite map condition and so on, but I can\'t find any decent documentation, either on a micros

Answer 1

Firstly, don't use dot, it matches everything and is naturally greedy. Use character negation instead: ([^\n]+). Try this, then re-run, and if that doesn't work, try adding /? again on the pattern attribute.

Answer 2

This should do it:

<rewrite>
    <rewriteMaps>
        <rewriteMap name="ShortURLs">
            <add key="terms" value="/en-us/terms-and-conditions/"/>
            <add key="privacy" value="/en-us/privacy-and-cookies/"/>
            <add key="buy" value="/en-us/where-to-buy/"/>
        </rewriteMap>
    </rewriteMaps>
    <rules>
        <rule name="Short URL redirects">
            <match url="^(.+?)/?$" />
            <conditions>
                <add input="{ShortURLs:{R:1}}" pattern="(.+)" />
            </conditions>
            <action type="Redirect" url="{C:1}" appendQueryString="true"/>
        </rule>
    </rules>
</rewrite>

You were quite close; I only needed to make three small changes:

• removed the leading slashes in the keys in the rewrite map
• used the non-greedy quantifier +? in the rule's match
• used a back reference to the match {R:1} in the condition input

I share your experience in having trouble finding decent documentation; I had to experiment my way through, with help from the following articles:

• http://www.iis.net/learn/extensions/url-rewrite-module/using-rewrite-maps-in-url-rewrite-module
• http://technet.microsoft.com/en-us/library/ee215190(v=ws.10).aspx