Phone format filtering on nrs without a - sign

I have local SuiteCRM 7.6 and wonder how to filter out the phone numbers which do not have a -
(stroke) in the number. like 00311234567 I need 0031-1234567 . I can do this manually but
many nrs need to be updated, anyhow what helps is to filter the number without a - stroke sign
thanks for help
William