Imports System
Imports System.Linq
Module Program
Sub Main()
Dim s1 As String = "c# c++ java php javascript vb"
Dim s2 As String = "c python c++ c# java node.js"
Dim matches = GetCommonWords(s1, s2)
For Each word In matches
Console.WriteLine(word)
Next
End Sub
Function GetCommonWords(a As String, b As String) As String()
Dim words1 = a.Split(" "c, StringSplitOptions.RemoveEmptyEntries)
Dim words2 = b.Split(" "c, StringSplitOptions.RemoveEmptyEntries)
Return words1.Intersect(words2).ToArray()
End Function
End Module
' run:
'
' c#
' c++
' java
'