Question

OK, I'm wondering if someone can lend a hand with a regex I'm trying to write.

Basically, what I want to do is use IIS urlrewrite module to do a redirect to a specific URL if the user accesses a URL on another site. The only catch is I have to also capture a bit of the query string, and move it into the redirect.
so here is the input, the URL that a user may access would look like:

https://of.example.com/sfsv3.aspx?waform=pro&language=en

I want to match that URL (either http or https, case insensitive), and capture from it also one piece of information, the two letter language code. then the url i want to forward the user to looks like:

http://example.com/ca/en/ppf

(where en is replaced by whatever i captured above)

So, I'm working with IIS Rewrite module, and I've gotten my input data and regex in, so far the regex pattern I have is this:

https?://of.example.com/sfsv3.aspx\?waform=pro&amp;(language=(..))

so basically i'm matching the whole string, plus a group and a subgroup for language and it's code. in the IIS test pattern dialog, this is working.

I get the following

{R:1} language=en

{R:2} en

great! so then my IIS rewrite rule should look like this to redirect the user:

<system.webServer>
    <rewrite>
      <rules>
        <rule name="test" stopProcessing="true" enabled="true">
          <match url="https?://of.example.com/sfsv3.aspx\?waform=pro&amp;(language=(..))" ignoreCase="true" />
          <action type="Redirect" url="http://www.example.com/ca/{R:2}/ppf" />
        </rule>
      </rules>
    </rewrite>
  </system.webServer>

this all seems right to me. however, the redirect is not occurring. it seems to have a problem with the part \? (an escaped question mark to mark the start of the query string). if this is included, then the redirect simply does not happen.

Can you help me figure out how to get it work?

Answer 1

为了记录，我想通了。这是正则表达式的一个特例，在web.config中运行它作为urlrewrite操作的一部分。在这种情况下，您无法使用简单的正则表达式处理查询字符串，您必须在查询字符串中加入条件。最终结果起作用的是：

    <system.webServer>
        <rewrite>
            <rules>
                <rule name="redirect" stopProcessing="true" stopProcessing="true" enabled="true">
                    <match url="sfsv3.aspx\.aspx" ignoreCase="true"/>
                    <conditions>
                        <add input="{QUERY_STRING}" pattern="subject=PROPRCH" />
                        <add input="{QUERY_STRING}" pattern="(..)/subject" />
                    </conditions>
                    <action type="Redirect" url="https://www.example.com/ca/{C:1}/forms/ppf" appendQueryString="false"/>
                </rule>
            </rules>
        </rewrite>
    </system.webServer>

Regex to redirect a url using url rewrite

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