Salesforce doesn't support multiple values defined in process builder or flows. It is mentioned in the article
The Lightning Process Builder and Flow do not support comma-separated
values in rule criteria.
Using the same condition as above:
Set Filter Conditions:
1) [Case].Contact.Email CONTAINS email@example.com
2) [Case].Contact.Email CONTAINS firstname.lastname@example.org
Filter Conditions (Customize the filter logic): (1 OR 2)
(P.S. I tried adding upto 38 conditions and it was going on and on. )
You could also use the formula editor as well
OR([userrolefield] = 'Role1' ,
[userrolefield] = 'Role2' ,
[userrolefield] = 'Role3' ,
[userrolefield] = 'Role-n'