Split String

Question

Hello everyone,

I was wondering if there is a way to determine if a string contains a value in a array without using a loop. Does the array class have a function for that?

Thanks.

Answer 1

You can use .Contains extension.

• First example finds karen againsts Karen because of the comparer
• Second example does not as strings are case sensitive.

So it's wise to know if an exact match is needed or not.

Dim findThisName = "Karen"
Dim someArray = New String() {"karen", "bill", "mary"}

Dim test = someArray.Contains(findThisName, StringComparer.OrdinalIgnoreCase)
If test Then
    Console.WriteLine($"{findThisName} was found case insensitive")
Else
    Console.WriteLine($"{findThisName} was not found case insensitive")
End If

test = someArray.Contains(findThisName)
If test Then
    Console.WriteLine($"{findThisName} was found case sensitive")
Else
    Console.WriteLine($"{findThisName} was not found case sensitive")
End If

Answer 2

You can do something like:

searchstrings.Find(Function(f) s1.Contains(f))

The following is a complete sample.

Dim s1 As String = "RedGreenBlue"
Dim s2 As String = "BlackWhite"
Dim searchstrings As New List(Of String) From {"Blue", "Orange"}
Dim v As String
v = searchstrings.Find(Function(f) s1.Contains(f))
Console.WriteLine("Found {0}",If(v Is Nothing, "nothing", v))
v = searchstrings.Find(Function(f) s2.Contains(f))
Console.WriteLine("Found {0}",If(v Is Nothing, "nothing", v))

See FindStringInArrayInStringVB for a fiddle you can use to try it.