Regex Modifiers in Webmethods

I am trying to use a regex pattern in a Webmethods map step. The problem is to ignore the case of string matching with regex modifiers.
For example:

input is "TEST" or "Test" or "Test"

Branch on 'input'
/test/i : MAP

      

        
        
        
      

    

But as I read on various webmethods forums that using access modfiers in Webmethods is a limitation. Thus, I cannot use '/ i'.
Any idea or hint on how I could accomplish this?
Thanks in advance.