WPF: combining TextBox input and validation rules - wpf

Question

I am learning about properly implementing input validation. I have reviewed dozens of similar questions about different aspects of it, but for my case, combining all these different solutions is confusing. In the essence, I have a bunch of textboxes in my application that need to be validated by these requirements:
All textboxes must allow numeric values. Some textboxes must allow positive/negative Doubles, some only positive/negative Integers, some only positive variants of each. Meaning that user can enter 0-9, . and -, but only once. Regex filter ("[^0-9.-]+") can filter such inputs, but it doesn't prevent the user from entering something like 9.1.2 or -5-5, so it doesn't work.
Some textboxes must allow entering multiple valid numbers separated by a space, like 1 5.61 -7.2. So the user can enter a space symbol now as well, but only after a valid number, and only once (so that they don't place five spaces between numbers). Meaning that if the user types one space, he should not be allowed to type another in sequence.
If the user enters an invalid value (or multiple values) that cannot be parsed into integer/double, the textbox should fix it automatically. For example, if user enters 123., it should automatically be corrected into 123. If the user enters nothing, or just one symbol, like -, textbox should automatically restore previous valid value.
So right now, the textbox (for single values, I haven't solved multiple values yet) is defined as:
<TextBox x:Name="numericValuesTextBox" PreviewTextInput="PreviewTextBoxNumeric">
<TextBox.Text>
<Binding Path="UserValues" Converter="{StaticResource StringToDoublesArrayConverter}">
<Binding.ValidationRules>
<local:DoublePositiveOrNegative/>
</Binding.ValidationRules>
</Binding>
</TextBox.Text>
</TextBox>
PreviewTextBoxNumeric - this bit handles that only valid characters can be entered:
Private Sub PreviewTextBoxNumeric(ByVal sender As Object, ByVal e As TextCompositionEventArgs)
Dim regex As Regex = New Regex("[^0-9.-]+")
e.Handled = regex.IsMatch(e.Text)
End Sub
However, like I said, it still doesn't prevent the user from entering values that later cannot be converted to an integer or double, causing an exception. PreviewTextInput event only checks a single character only, so it is not very useful.
And the DoublePositiveOrNegative rule looks like this:
Public Class DoublePositiveOrNegative
Inherits ValidationRule
Public Overrides Function Validate(value As Object, cultureInfo As Globalization.CultureInfo) As ValidationResult
Dim result As Double
If Double.TryParse(value, result) Then
Return ValidationResult.ValidResult
Else
Return New ValidationResult(False, $"Invalid number")
End If
End Function
End Class
However, all this does right now is set the border of the textbox in red - it doesn't restore the original value. And I can't see how to store that value here, since this class is instantized only during the binding attempt.
I am unsure on how to combine all these requirements into neat, compact and reusable solution that I could use anywhere on my application. I do not know how to make input check rule (currently that Regex bit) that checks not only if valid character is being entered, but also if it can be logically entered to make a valid number (not allowing several commas, etc.). And also, how to restore the original value if the input is still invalid (ideally, this shouldn't be needed if the first check works right).
Any suggestions?