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Hi Ruan Swart,
I go through the post carefully. It seems like you are trying to use Regex to do data validation on a column in SharePoint. I'm afraid there is no out of box feature for it. Really sorry for the inconvenience.
Considering it's a SharePoint development question, to make sure you get the dedicated assistance, I sincerely recommend you post the question in Microsoft Q&A Community, it is a specific channel handling SharePoint customization and development related queries, members and experts will assist you further.
Thanks for your patience and understanding.
Have a nice day and stay safe.
Best regards,
Tina