Generate Conditional Code From String - asp.net

Question

I want to generate conditional code of the string, which will check the string. An example is the following string
sampleString = "C123 A091 A111 A122 B120 B309 C000"
and examples of conditional string I have is as follows
example 1 :
A123 + B123 would I generate as
if sampleString.contains ("A123") And sampleString.contains ("B123") Then
'doSomething
else
'doSomething
end if
example 2 :
A111+A122+(B120/-C123)
if sampleString.contains ("A111") And sampleString.contains ("A122") And (sampleString.contains ("B120") Or Not sampleString.contains ("C123")) Then
'doSomething
else
'doSomething
end if
Plus (+) means AND
Minus (-) means NOT
Slash (/) means OR
Will I be able to do this in VB.Net?

Answer 1

Use Regex to solve the Contains problem by finding the matches and replace them with 1 or 0.
Dim sample As String = "C123 A091 A111 A122 B120 B309 C000"
Dim input As String = "A111 + A122 + ( B120/- C123)"
Dim nRegex As New Regex("\w+", RegexOptions.IgnoreCase)
Dim nMatches As MatchCollection = nRegex.Matches(input)
For Each nMatch As Match In nMatches
input = input.Replace(nMatch.Value, IIf(sample.Contains(nMatch.Value), "1", "0"))
Next
Now replace the special characters you have with ones that can actually give you the right result when evaluated as a math expression (Since logic is originally math).
input = input.Replace(" ", "")
input = input.Replace("+", "*")
input = input.Replace("/", "+")
input = input.Replace("-1", "0").Replace("-0", "1")
after all this you will get this expression :
1*1*(1+0)
You can now use any math evaluator as suggested in this Answer. If the result you get is bigger than zero means Its logically True. Otherwise False