Regex newbie here, I'm trying to create a validation rule which will restrict users from entering a number or a special characters to a certain field.
This is what I have so far:
!IsNew() && REGEX(Origin__c, '[!@#$%^&*(),.?":{}|<>0-9]')
However, it does not work as I'm still able to insert inputs such as: 'abc123' or 'abc@df'
I checked the regex expression in regextester.com and it worked, it detected what I needed, but in SF it didn't, so what am I missing?