Vb: how can I search for terms, defined in richtextbox1, and print lines that have those terms from richtextbox2 into richtextbox3?

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Hi All!

Complete noob trying to grasp some basic concepts.

Working with VB in Visual Studio.

How can I search for terms, defined in RichTextBox1, and print lines that have those terms from RichTextBox2 into RichTextBox3?

What I have tried:

If RichTextBox1.Contains(RichTextBox2.Text) Then

...that's actually as far as I've gotten.

Posted 15-Sep-20 9:56am

CapsLock220

Updated 15-Sep-20 10:33am

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Sandeep Mewara · Answer 1 · 2020-09-15T10:34:00

Would suggest you to start from here: RichTextBox.Find Method (System.Windows.Forms) | Microsoft Docs[^]

Reference example (not exactly you need, i.e. print per line part)

VB

Public Function FindMyText(ByVal searchText As String, ByVal searchStart As Integer, ByVal searchEnd As Integer) As Integer
    ' Initialize the return value to false by default.
    Dim returnValue As Integer = -1

    ' Ensure that a search string and a valid starting point are specified.
    If searchText.Length > 0 And searchStart >= 0 Then
        ' Ensure that a valid ending value is provided.
        If searchEnd > searchStart Or searchEnd = -1 Then
            ' Obtain the location of the search string in richTextBox1.
        Dim indexToText As Integer = richTextBox1.Find(searchText, searchStart, searchEnd, RichTextBoxFinds.MatchCase)
            ' Determine whether the text was found in richTextBox1.
            If indexToText >= 0 Then
                ' Return the index to the specified search text.
                returnValue = indexToText
            End If
        End If
    End If

    Return returnValue
End Function

Try out!