HMR for conditional ANI change

Hello, could anyone suggest how to construct an HMR for next case - 

 

1. if From=123 change it to 321

2. the rest has to be changed to 456.

 

It's simple to construct regular expression for first condition - ^123$, or perhaps ^123.* if we have more then 3 digits. But are there any way to get the inversion of it? I've been trying to use ^(!?123), but it doesn't seem to work...

 

thank you in advance!