Code:
on 1:TEXT:$( $+ $strip(!order) $+ ):#:

will do the same as:

on 1:TEXT:!order:#:


The $strip would only be applied to the word !order
since you didnt put any control codes there is
nothing to strip..

Your original regex is the best way to filter
out the control codes but to be the same you need
to do:

Code:
on $1:text:/^!order$/iS:#: