Unicode正则表达式

Question

I'm trying to handle the keys that are pressed from keyboard. So I made this Regex according to Regex Unicode :

private void tbName_KeyDown(object sender, KeyRoutedEventArgs e)
{
    if (!Regex.IsMatch(e.Key.ToString(), @"^[\p{L}\p{Z}]$"))
    {
       e.Handled = true;
    }
}

The problem is that it's only accepting letters, but white spaces (\\p{Z}) not, and it should accept.

Btw, I tried \\s (as usual), tried to put an "or" ( | ) between the 2 unicodes, but no way. It definitively don't want to work.

EDIT 1:

I tested char.IsLetter, but it allows a lot of non-letters like: [ []^~´`ªº ] and all numbers of lateral numeric keyboard of notebook, for example, while Unicode Regex do not. So I want a solution with Regex.

Answer 1

The problem is not with your regex, but with e.Key.ToString() . KeyRoutedEventArgs.Key is a value of the VirtualKey enum-type , such as Space or f5 or H . So your approach happens to work for letters — the name of the H key is H — but this is mostly a coincidence.

Using e.Key is fine, but you should examine the value either by comparing it to the enum constants, or by casting it to an int and looking at the numeric values (documented in the table above), or a mixture of these.

For example:

private void tbName_KeyDown(object sender, KeyRoutedEventArgs e)
{
    if (e.Key == VirtualKey.Space) {
        // ignore spaces
    } else if ((int)e.Key >= (int)VirtualKey.A && (int)e.Key <= (int)VirtualKey.Z) {
        // ignore letters
    } else {
        e.Handled = true;
    }
}