Decimal in clamped TextBox

private static void OnTextChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
    var s = (string)e.NewValue;
    var regex = new Regex(@"^(-?\d+\.|-0?)$");
    if (string.IsNullOrEmpty(s) || regex.Match(s).Success)
        return;

    if (double.TryParse((string)e.NewValue, out var oldValue))
    {
        if (!(bool)d.GetValue(EnforceRangeProperty))
            return;

        var min = (double)d.GetValue(MinProperty);
        var max = (double)d.GetValue(MaxProperty);

        var newValue = Math.Max(min, oldValue);
        newValue = Math.Min(max, newValue);

        // ReSharper disable once CompareOfFloatsByEqualityOperator
        if (newValue == oldValue)
            return;

        d.SetValue(TextProperty, newValue.ToString(CultureInfo.InvariantCulture));
        return;
    }

    // If we can't parse the text, revert to the old value.
    d.SetValue(TextProperty, (string)e.OldValue);
}