CODEWITHSUNDEEP
iisurl-rewriting
Rafael Herscovici
Rafael Herscovici

Reputation: 17124

IIS URL Rewrite - if query parameter(s) is missing

So this is "not your everyday requirement" for today :)

I want to create a rule that will redirect to some other page only if some query parameters are missing.

i found a few examples that will rewrite/redirect if the parameters exists, but how do i go about if i want to check if they dont exists?

for example, this will test if the parameters exist and redirect based on that:

        <rule name="RedirectUserFriendlyURL1" stopProcessing="true">
            <match url="^$" />
            <conditions>
                <add input="{QUERY_STRING}" pattern="^lon=([^=&amp;]+)&amp;lat=([^=&amp;]+)&amp;zoom=([^=&amp;]+)$" />
            </conditions>
            <action type="Redirect" url="/{C:1}/{C:2}/{C:3}" appendQueryString="false" />
        </rule>

how can i change this rule to test if they do NOT exist?

Upvotes: 2

Views: 2717

Answers (1)

Vatan Aggarwal
Vatan Aggarwal

Reputation: 36

^((?!regex).)*$ Is the regular expression for does not contain regex. read more here http://bloggernitin.blogspot.in/2007/12/regex-for-doesnt-contain.html

If you are looking for something like lon=xyz doesn't exists in params then use this regex ^(?!lon=(xyz)) this will check if lon param is not there at the start of string

More examples -

In case you have a case where only zoom param is there is query string and lat/lon are missing
e.g. querystring a) "lat=23&zoom=10" b) "zoom=13"

regex - ^(?!lon=.)(?!lat=.)zoom=([^=&]+)
result - a) no match b) match $1= 13

now you can give default value to other params.

Upvotes: 1

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