Question

I have the following Regex-pattern: "[A-TVWZ]". I need it to accept also Empty strings "", how can I insert that in my pattern? I need it for my DataGridView, because when the User leaves the cell without writing anythig it gets an error in validating…

Answer 1

Maybe this is too simple; I would check for empty strings without regular expressions.

E.g.:

if ( string.IsNullOrEmpty( myString ) || Regex.IsMatch( "[A-TVWZ]", myString )
{
    ....
}

See:

• String.IsNullOrEmpty method.
• Regex.IsMatch method.