The IIS URL Rewrite Module ships with 3 built-in functions:

* ToLower - returns the input string converted to lower case.
* UrlEncode - returns the input string converted to URL-encoded format. This function can be used if the substitution URL in rewrite rule contains special characters (for example non-ASCII or URI-unsafe characters).
* UrlDecode - decodes the URL-encoded input string. This function can be used to decode a condition input before matching it against a pattern.

The functions can be invoked by using the following syntax: {function_name:any_string}

The question is: can this list be extended by introducing a Replace function that's available for changing values within a rewrite rule action or condition?