Empty string in Regex C#

c#, regex

Solution

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.

Problem

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...

Original source