Thanks for your helpful reply. After your reply and with the help of the reference manual I figured out that in my script 'wildmatch' probably is the shortest way.
See 1. original script, 2. script as you suggested and 3. final solution.
1. IF ("Location Code" = 'COR-RETOUR' or "Location Code" ='COR AANTAL', 'HEDEL', "Location Code" ) As Vestiging,
2. if(MixMatch([Location Code],'COR-RETOUR','COR AANTAL')>0,'HEDEL',[Location Code]) as Vestiging,
3. if(wildmatch([Location Code],'COR*')>0,'HEDEL',[Location Code]) as Vestiging,
Again thanks for your help.