I dont think that this is possible unfortunatly without creating some sort of custom datatype.
What I usually do is to create a property description and in that description tell the user how he/she should format the URL. Maybe that could work for you?
How to customize regex validation messages in backoffice?
Hello,
Is it possible to replace the "Value is invalid, it does not match the correct pattern" with customized message?
Hi Ivan.
I dont think that this is possible unfortunatly without creating some sort of custom datatype.
What I usually do is to create a property description and in that description tell the user how he/she should format the URL. Maybe that could work for you?
Or maybe submit a feature request for custom regex validation messages? http://issues.umbraco.org/dashboard
All the best / Dennis
Thanks, Dennis!
I've posted feature request.
Do you know if it's possible to translate the error message?
Hi again Ivan.
That´ss great that you submitted it as a feature, helping to make Umbraco even better! #h5yr
Unfortunatly, looking at the source code, it looks like it could be hard to change this message without updating the core.
Screenshop from core:
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