Creating an Instead of Insert trigger that blocks certain values

Hi guys, I'd like to create an INSTEAD OF trigger for the Person.Address table in AdventureWorks so that anytime someone inserts a value that does not begin with a number in AddressLine1 column, it returns a message "Invalid, value must contain numbers".

Can someone please write the code for this? thanks.

This is what I managed to write but it's still accepting addresses without numbers in AddressLine1 column, what did I do wrong?

CREATE TRIGGER trg_PersonAddress_AfterInsert
ON Person.Address
INSTEAD OF INSERT
AS
BEGIN
IF EXISTS (SELECT AddressLine1 FROM Person.Address
WHERE AddressLine1 LIKE '[0-9]%')
INSERT INTO Person.[Address] (AddressID,AddressLine1,AddressLine2,City,StateProvinceID,PostalCode,SpatialLocation,rowguid,ModifiedDate)
SELECT AddressID,AddressLine1,AddressLine2,City,StateProvinceID,PostalCode,SpatialLocation,rowguid,ModifiedDate
FROM inserted
ELSE
PRINT 'Invalid must contain numbers'
END;