anchor.diff:  == Parameterize Rules
   
  -Parameterization is a core feature of Rewrite, adding flexibility and power to the configuration API.
  +Rule parameters allow for value extraction, modification, validation, and conversion before use in the application. Parameterization is a core feature of Rewrite, adding flexibility and power to the configuration API. Values from HTTP headers, URLs, GET and POST values, and more may all be parameterized as needed.
   
   === Basic Parameterization
   
  -The following rule demonstrates simple parameterization. 
  +Parameters are defined using braces notation inside a normal `String`, such as `"{example}"`. The following rule demonstrates simple parameterization, where we have a single parameter named "`path`".
   
   [source,java]  
   ----
  
positive.code: 
  ==== Regular Expression Constraints
  
  [source,java]  
  ----
   /* Parameter regular expression matching */
  .matches("[0-9]+")
  ----
  
  ==== Custom Constraints
  
  [source,java]  
  ----
   /* Parameter regular expression matching */
  .matches("[0-9]+")
  ----
  
negative.code: 
  The value of `{path}` is extracted from the +Condition+, and inserted into the +Operation+ at the specified location. So for an initial request of:
  
  `"/requested/lincoln"`
  
  The request will subsequently be forwarded to the internal path:
  
  `"/other/lincoln"`
  
  This is a very simple example of parameterization, but is also the most common. We will now take a closer look at how parameters can be used to meet specific requirements such as validation and conversion.
  
  [TIP]
  Custom conditions and operations may be parameterized if built-in functionality is insufficient. 
  
  === Configure Parameters
  
  