Answer 1

这是一个相当简单的解决方案。请注意，它会在“四”中找到“我们的”一词。如果这不合适，你可以写一些东西来消除重叠的匹配。

Private Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
    Dim SearchText As String = "One Two Three Four"

    Dim Keywords As String() = {"One", "Four", "our"}

    Dim WordMatches As New Generic.List(Of WordMatch)

    For Each KeyWord As String In Keywords
        Dim i As Int32 = 0

        While i <> -1
            i = SearchText.IndexOf(KeyWord, i, System.StringComparison.OrdinalIgnoreCase)

            If i <> -1 Then
                Dim MyMatch As New WordMatch
                MyMatch.CharIndex = i
                MyMatch.Word = KeyWord
                WordMatches.Add(MyMatch)
                i += KeyWord.Length
            End If
        End While
    Next
End Sub

Private Structure WordMatch
    Public CharIndex As Int32
    Public Word As String
End Structure