Eloqua Contact Washing Machine - Using RegEx on cleansing

Hello,

I'm trying to use regex for text field with delimited values (semi-colon, sample data: "Sales;Marketing;IT" or "Admin;Sales"), but I'm not sure how to exactly code it in the conditions field. The snippet below fails.

CWM Config:

Target field:

Is there documentation or a guide somewhere on how to write the regEx for this condition?

Basically I want to check if the field contains "Sales" in it, but so as to not to incorrectly check with similar values like "Sales Officer".