can I translate characters so if the mud sends 'pare dudasabru' (without quotes) in the middle of the line can mushclient automatically change those characters to 'hold person'??
in tintin its like this
#subs {%0'pare dudasabru'} {%0'hold person'}
You cannot do direct text substitutions but what you can do is use a trigger to match on the spell, omit that line from the output and replace it with the translated one. The only problem is that the translated line will be in the "world note" colour and not the original line colour.
I still say that omit from output should 'save' a copy of the triggering line for 'that' trigger, so that you can correctly recover the color info from it. I can see why it does things in the order it does, but at the same time it is counterproductive in 99% of the cases where you want that information imho. In cases where you need such info for 'any' line other than the current omitted one, it is probably easier to capture them as they arrive.