按位验证字符串是否为1-9a-zA-z的两种做法

Regex r = new Regex("[1-9a-fA-F]");
            for (int i = 0; i < strSource.Length; i++)
            {
                if (r.IsMatch(strSource[i].ToString()) == false)
                    return false;
            }
            return true;

Regex rowRegex = new Regex("\\A[0-9]+\\z");

            if (!rowRegex.IsMatch(tbRowCoordinate.Text))
            {
                MessageBox.Show("Please type correct row coordinate!");
                return;
            }

Dim rowRegex As New Regex("\A[0-9]+\z")

        If Not rowRegex.IsMatch(tbRowCoordinate.Text) Then
            MessageBox.Show("Please type correct row coordinate!")
            Return
        End If