Hi,

I am trying to write a validation formula that will allow two format types for UK phone numbers, these are;

01234 567890 and 0123 456 7890.

Whilst I can write a validation rule for one format type; 

NOT(REGEX(Phone, "\\d{4}( \\d{3})( \\d{4})")).

I cannot seem to write a rule that will allow for two. I had tried;

OR(NOT(REGEX(Phone, "\\d{4}( \\d{3})( \\d{4})")), NOT(REGEX(Phone, "\\d{5}( \\d{6})")))

But this does not work. Any advice to what I am hoping is a simple answer would be grateful.