Using negative look-ahead in non-native regex ?

Hi everyone, I'm currently trying to make a nice regex allowing me to get all processes with a certain name.

For that, I'm using Sys.FindAll("ProcessName", "regexp:MyRegex")

 

I want to find, for exemple, all the processes with a name starting with "myProcess_" but excluding "myProcess_other"

 

I've constructed the following regex :

 

(myProcess_(?!.*(other)).+)

This regex works perfectly fine in many regex testing websites.

 

Then, i'm using it like that :

 

Sys.FindAll("ProcessName", "regexp:(myProcess_(?!.*(other)).+)")

But it's failling to find any processes.

Any time i'm using a negative look-ahead, it's not finding anything.

 

Any suggestions ?

 

Thanks