I have a cell value like this:
This is a <\"string\">string, It should be <\"changed\">changed to <\"a\"> a number.
There
Select the cells containing your text and run this short macro:
Sub Kleanup()
Dim d As Range, s As String, rng As Range
Dim gather As Boolean, L As Long, DQ As String
Dim i As Long, s2 As String, CH As String
Set rng = Selection
DQ = Chr(34)
For Each r In rng
s = Replace(r.Text, "<" & DQ, Chr(1))
s = Replace(s, DQ & ">", Chr(2))
gather = True
L = Len(s)
s2 = ""
For i = 1 To L
CH = Mid(s, i, 1)
If CH = Chr(1) Then gather = False
If CH = Chr(2) Then gather = True
If gather And CH <> Chr(2) Then s2 = s2 & CH
Next i
r.Value = s2
Next r
End Sub