Extract Substring with variable start and length - sql

Question

I have a field from a horrible database in which every value is a string such as
Field Stage changed from "Kortec Sales Cycle/3 Proposal" to "Kortec Sales Cycle/Postponed"
Or
Field Stage changed from "Kortec Sales Cycle/5 Evaluate" to "Kortec Sales Cycle/6 Implement"
I need to make 2 calculated columns from this, named 'From' and 'To', with the two values within the quote marks or the number they start with (all 7 stages except 'Postponed' begin with a number).
It's the 'To' field I need the most. I've had a try using Instr(), InStrRev(), Left, and Mid functions, but no joy so far. I've also searched online for similar problems but haven't come across any text manipulation requirements like this.
Anyone know how I should go about breaking this down?
Closest I (think I) got was
SELECT RIGHT([OppMovs (Base)].[DETAILS], InStrRev([OppMovs (Base)].[DETAILS], 'to')-3)
FROM [OppMovs (Base)]

Answer 1

Split can be used to easily extract these:
s = "Field Stage changed from ""Kortec Sales Cycle/3 Proposal"" to ""Kortec Sales Cycle/Postponed""
? s
Field Stage changed from "Kortec Sales Cycle/3 Proposal" to "Kortec Sales Cycle/Postponed"
? Split(Split(s, "from """)(1), """")(0)
Kortec Sales Cycle/3 Proposal
? Split(Split(s, "to """)(1), """")(0)
Kortec Sales Cycle/Postponed
However, for use in a query, you must create small helper functions like:
Public Function GetFrom(ByVal Value As String) As String
GetFrom = Split(Split(Value, "from """)(1), """")(0)
End Function
Public Function GetTo(ByVal Value As String) As String
GetTo = Split(Split(Value, "to """)(1), """")(0)
End Function