Rename query string parameter if it exists

Question

I'm trying to use Tuckey's UrlRewriteFilter to rename a query string parameter if it exists. I want to rename "foo" to "bar".

Examples:

• /hello/hey/?foo=123 should be /hello/hey/?bar=123

• /nascar/?a=b&foo=lol should be /nascar/?a=b&bar=lol

Any ideas?

Answer 1

Try this:

<urlrewrite>

    <rule>
       <from>^(.*)(\?|&)foo=(.*)$</from>
       <to type="redirect">$1$2bar=$3</to>
    </rule>

</urlrewrite>