I'm cleaning a dirty directory. A few (just a thousand or so) records have their postcode messed up, either blank or containing other address data. Usually that means city or county.
A Postcode, whether UK, US, or Canada, has at least one digit in it. A city or county or blank field doesn't. So if I want to filter for just the bad-postcode rows, I want: All rows where postcode column has no numeric digits.
Filter allows 'doesn't contain' but only for specific strings, apparently not expressions like [0..9]. So how?