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IIS redirect rule with regex inside condition

I get 500 error when having this rule:
<rule name="Remove Query String" stopProcessing="true">
<match url="(.*)" />
<conditions>
<add input="{QUERY_STRING}" pattern="^url=[^&]+" />
</conditions>
<action type="Redirect" url="{C:1}webp" appendQueryString="false" />
Problem is inside
<add input="{QUERY_STRING}" pattern="^url=[^&]+" />,
actually pattern seems wrong but works corrently when I check it online. All parsers parse it.
What I want to achieve is to redirect all URL that have query string url= to url whose value corresponds to the value of url in initial request but ignroeing everything after &, or everything after something else (like webp for example) That is reason I want to separate pattern in multiple logical groups.

Redirect www to non www urls

My goal is to redirect all www.* urls to non-www urls. For example:
If the url is www.mydomain.com/users it should redirect to mydomain.com/users.
In order to achieve that I have written the following code in my web.config:
<rule name="Redirect www.* urls to non www" stopProcessing="true">
<match url="*" />
<conditions>
<add input="{HTTP_HOST}" pattern="^www$" />
</conditions>
<action type="Redirect" url="{HTTP_HOST}/{R:0}" redirectType="Permanent"/>
</rule>
but it does nothing and I can see the www urls not redirecting to non www urls.
Can you share what I am doing wrong there?
Do note that I don't want to add any hard coded domain in that rule. I want to make it generic.
I need a generic solution where in my rule there is no where a hard coded domain and a hard coded protocol is present.

Well, here is the solution I came up with.
I have provided the solution with all the details along with comments comments for the regex, capturing groups etc. used in the rule:
<rule name="Redirect www.* urls to non www" enabled="true">
<!--Match all urls-->
<match url="(.*)"/>
<!--We will be capturing two groups from the below conditions.
One will be domain name (foo.com) and the other will be the protocol (http|https)-->
<!--trackAllCaptures added for tracking Capture Groups across all conditions-->
<conditions trackAllCaptures="true">
<!-- Capture the host.
The first group {C:1} will be captured inside parentheses of ^www\.(.+)$ condition,
It will capture the domain name, example: foo.com. -->
<add input="{HTTP_HOST}" negate="false" pattern="^www\.(.+)$"/>
<!-- Capture the protocol.
The second group {C:2} will be captured inside parentheses of ^(.+):// condition.
It will capture protocol, i.e http or https. -->
<add input="{CACHE_URL}" pattern="^(.+)://" />
</conditions>
<!-- Redirect the url too {C:2}://{C:1}{REQUEST_URI}.
{C:2} captured group will have the protocol and
{C:1} captured group will have the domain name.
"appendQueryString" is set to false because "REQUEST_URI" already contains the orignal url along with the querystring.
redirectType="Permanent" is added so as to make a 301 redirect. -->
<action type="Redirect" url="{C:2}://{C:1}{REQUEST_URI}" appendQueryString="false" redirectType="Permanent"/>
</rule>
It will do the following redirects:
http://www.foo.com -> http://foo.com
https://www.foo.com -> https://foo.com
http://www.foo.com?a=1 -> http://foo.com?a=1
https://www.foo.com?a=1 -> https://foo.com?a=1

How to rewrite a URL without leaving the current page in C#?

I want to Re-write my URL without leaving the current.
I find large number of post related to URL Re-writing, but i did'n get success.
I want if user enter this URL -
http://localhost:16185/Company/CareerWebsite.aspx?org_name=hire-people
URL automatically convert into this format -
http://localhost:16185/hire-people
but the original page (Company/CareerWebsite.aspx?org_name=hire-people) does not leave.
Means, user did't see the original URL(Company/CareerWebsite.aspx?org_name=hire-people) in browser. User can only see virtual URL like /hire-people.
Thanks for help...!!!

Well, if you want to do it directly same way as you described you need to do Redirect 301 or 302. For url-rewriting you'l probably need to install urlRewrite module for iis.
So far you'l need some kind of following url-rewrite rule in web.config file:
<rule name="RedirectUserFriendlyURL1" stopProcessing="true">
<match url="^Company/CareerWebsite\.aspx$" />
<conditions>
<add input="{QUERY_STRING}" pattern="^org_name=([^=&]+)$" />
</conditions>
<action type="Redirect" url="{C:1}" appendQueryString="false" />
</rule>

Manually append query string using Url Rewrite in IIS

I'm trying to create a rewrite rule such as:
~/company_search.aspx?cat=987&page=2&loc=1234
to
~/company_category/987/estiatoria/?loc=1234&page=2
My rewrite rule is:
<rule name="Company Category">
<match url="company_category/([0-9]+)/(?:[^/]*)/?" />
<action type="Rewrite" url="company_search.aspx?cat={R:1}" appendQueryString="true" />
</rule>
The part /estiatoria/ in the sample rewritten url is optional for seo optimization and not specified in the actual querystring neither has any other use. When I do a postback I get the cat parameter 2 times with a value 987,987 and my server-side code gets messed up.
So I tried to manually append the querystring in order to exclude the cat parameter and append all the others. So I changed the rule to:
<rule name="Company Category">
<match url="company_category/([0-9]+)/(?:[^/]*)/?(?:\?|&)?(.*)" />
<action type="Rewrite" url="company_search.aspx?cat={R:1}&{R:2}" appendQueryString="false" />
</rule>
But I don't get any other values in the querystring except cat. Am I doing something wrong?
Update:
I think I must add a querystring condition in order to exclude the cat parameter and then append the rest matching result. So for the querystring:
?cat=987&page=2&loc=1234
I'd like to get:
?page=2&loc=1234
and the cat parameter could be in any order or not present.
I tried:
<rule name="Company Categories Search">
<match url="company_category/([0-9]+)/(?:[^/]*)/?" />
<conditions>
<add input="{QUERY_STRING}" pattern="(?!cat=[0-9]+)(.*)(cat=[0-9]+|$)(?!cat=[0-9]+)(.*)" />
</conditions>
<action type="Rewrite" url="company_search.aspx?cat={R:1}&{C:1}&{C:3}" appendQueryString="false" />
</rule>
When I hit the url:
~/company_category/987/estiatoria/?page=2&loc=1234
I get on the server side Request.Querystring the following value:
cat=987&page=2&loc=1234&
but when I do a postback I get:
cat=987&at=987&page=2&loc=1234&
Can someone please help me with that last regex condition?
Update 2:
I've come to a solution but it doesn't cover every scenario:
<rule name="Company Categories Search">
<match url="company_category/([0-9]+)/(?:[^/]*)/?" />
<conditions logicalGrouping="MatchAny">
<add input="{QUERY_STRING}" pattern="(cat=[0-9]+)(.*)" />
<add input="{QUERY_STRING}" pattern="(^)(.*)" />
</conditions>
<action type="Rewrite" url="company_search.aspx?cat={R:1}&{C:2}" appendQueryString="false" />
</rule>
I've used 2 condition rules with MatchAny option in order to match one: the query string when the cat value is present in the mapped url (currently only in postbacks) and two: when it's not present.
If the cat parameter is somehow between page and loc parameters the previous parameter is not included in the query string. If anyone has a better solution please let me know.

Regex find a string within an url, non case sensitive

I have the url:
http://primarydomain.com/sites/secondarydomain/?foo=bar
What regex expression could I use to match the url for sites/secondarydomain - not case sensitive (this is for a rule in a web.config file but requires standard regex)?
To put it into context, I am writing a web.config url rewrite rule to remove sites/secondarydomain from all urls (due to a multiple sites being hosted on the same package).
<rule name="Remove full hosting path">
<match url="***Regex goes here***" ignoreCase="true"/>
<action type="Redirect" url="http://secondary.com/{R:1}" redirectType="Permanent" />
</rule>
I am looking to match only the directories (not the query string) in order to redirect the user (hence removing the sites/secondarydomain).
Update: It looks like I want to rewrite the url and not redirect, here is the current web.config rule that doesn't quite work:
<rule name="TestRule">
<match url=".*" />
<conditions>
<add input="{PATH_INFO}" pattern="^(/hostedsites/clemones_htdocs)(/.*)"/>
</conditions>
<action type="Rewrite" url="\{C:2}" appendQueryString="true" />
</rule>
Where my secondary domain is http://clemones.com/
and the path I'm trying to get rid of: http://clemones.com/hostedsites/clemones_htdocs/
FOR testing, http://clemones.com/shizzle works as a destination (hence sadly http://clemones.com/hostedsites/clemones_htdocs/shizzle also works).
Thanks in advance

Have you tried:
To elaborate, this only applies the regex to the path, not the root url:
<rule name="TestRule">
<match url=".*" />
<conditions>
<add input="{PATH_INFO}" pattern="^(/sites/secondarydomain)(/.*)"/>
</conditions>
<action type="Rewrite" url="\{C:2}" appendQueryString="true" />
</rule>
There are multiple groups resulting from the condition, {C:2} represents everything that comes after "/sites/secondarydomain/", excluding the query string which is appended by choosing "appendQueryString=true".
It allows you to break out the parts you want to take action on, so yes it is different than just applying a regular expression to the entire url.
Here is an article that explains how this works:
http://weblogs.asp.net/owscott/archive/2010/01/26/iis-url-rewrite-hosting-multiple-domains-under-one-site.aspx

Try a lookbehind (?<=(http://primarydomain.com/))[^\b]*
EDIT:
If you want to exclude the querystring... (?<=(http://primarydomain.com/))[^?]*
If you want to be more strict for whatever reason (like only allowing alphabet characters in the directory), you can try something like this (?<=(http://primarydomain.com/))[a-zA-Z/]*[a-zA-Z]

if the domain is always going to be http://primarydomain.com/sites/ then I would attack it like this:
match url="http://primarydomain.com/sites/([A-Za-z0-9_]+)/.*";

A combination lookbehind and lookahead will match the string you want:
(?<=.\w+/)\w+/\w+(?=/.*)
That being said, the {R:1} in your example really looks like a Regex backreference, so maybe that's why things aren't working as expected. If this is true, you may need something like this instead:
.\w+/(\w+/\w+)
Never done IIS rewriting, so YMMV. The two regular expressions do work (tested) on the examples you've given so far, and more generic URLs like:
http://primarydomain.com/hostedsites/clemones_htdocs/index.aspx?foo=bar
http://anydomain.net/sites/secondarydomain/index.aspx?foo=bar
...