CXTMaskEdit is indeed useful, but most of the time I find the filtering options inadequate. The obvious evolution of such a control is filtering using Regular Expressions. Implementing this should be quite straight-forward since a regex engine is already part of C++0x. That is, using Boost ( http://www.boost.org - http://www.boost.org ) you get all what you need.

 

Of course, any dependencies on the Boost library are not desirable until it is indeed incorporated into C++, so a good solution would be something like this:

 

#ifdef XTP_USE_BOOSTLIB

class CXTPRegexEdit

{

    ...

    BOOL SetExpression(LPCTSTR szRegex);

};

 

Have a look at http://www.codeproject.com/editctrl/FilterEdit.asp - http://www.codeproject.com/editctrl/FilterEdit.asp  for inspiration.

 

I really think such a control has potential.