From: Csaba Gabor on
On Feb 11, 1:17 pm, "Steve" <cerberu...(a)gmail.com> wrote:
> LJB wrote:
> > In regular expression how do I say characters A-Z except I and O? I'd
> > rather not list each of the 24 valid characters.
>
> [A-HJ-NP-Z]
>
> Lists of Matching Characters (Scripting)
> <http://msdn.microsoft.com/en-ca/library/ta6y6h4z%28VS.85%29.aspx>

Here is an alternate approach for testing at a specific
point in the string using look ahead which might be
more compact if subtracting off several letters:
(?=[A-Z])[^IO]
or using negative lookahead:
(?![IO])[A-Z]

Csaba Gabor from Vienna