code: public static Scheme matches(final String pattern)
     {
        return new Scheme(pattern) {
           @Override
           public String toString()
           {
              return "Scheme.matches(\"" + pattern + "\")";
           }
        };
     }
docs: Create a {@link Condition} to inspect the current request scheme, comparing against the given pattern.
  <p>
  The given pattern may be parameterized using the following format:
  <p>
  <code>
  https<br/>
  mailto<br/>
  {scheme}</br>
  {scheme}-custom <br>
  ...
  </code>
  <p>
  
  @param pattern {@link ParameterizedPattern} specifying the {@link Scheme} of the current {@link Address}.
  
  @see {@link ConfigurationRuleParameterBuilder#where(String)}