find char in string RRS feed

  • Question

  • Dim testString As String = "ABCDEFGHIJKL"
    Dim searchChar1 As String = "BC"
    Dim searchChar2 As String = "JK"


      i went put "BCDEFGHIJK" in textbox but how ?

    • Edited by Sajjad.h Saturday, August 10, 2019 9:07 AM
    Saturday, August 10, 2019 9:04 AM

All replies

  • Hello,

    It's unclear what you want, from what I see it seems like an append to the beginning and end of the string rather than a find Char as there are no Char there e.g. Dim SearchChar1 As Char = "A"c would be a char.

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    Saturday, August 10, 2019 9:37 AM
  • Hi

    Here is some code that willdo EXACTLY as you ask - take note, string case is NOT ignored.

    ' Form1 with
    ' TextBoxes 1-4 and
    ' Button1
    Option Strict On
    Option Explicit On
    Public Class Form1
      Function GetSubString(testString As String, searchChar1 As String, searchChar2 As String) As String
        Dim i1 As Integer = testString.IndexOf(searchChar1(0))
        Dim i2 As Integer = testString.IndexOf(searchChar1(1))
        Dim result As String = Nothing
        If i2 = i1 + 1 Then
          Dim i3 As Integer = testString.IndexOf(searchChar2(0))
          Dim i4 As Integer = testString.IndexOf(searchChar2(1))
          If i4 = i3 + 1 Then
            result = testString.Substring(i1, i4 - i1 + 1)
          End If
        End If
        Return result
      End Function
      Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
        TextBox4.Text = GetSubString(TextBox1.Text, TextBox2.Text, TextBox3.Text)
      End Sub
    End Class

    Regards Les, Livingston, Scotland

    Saturday, August 10, 2019 4:20 PM
  • Hi,

    try my code:

    Imports System.Text.RegularExpressions
    Public Class Form1
        Dim testString As String = "ABCDEFGHIJKL"
        Dim searchChar1 As String = "BC"
        Dim searchChar2 As String = "JK"
        Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
            Dim rg As Regex = New Regex("(?=(" & searchChar1 & "))[.\s\S]*?(?<=(" & searchChar2 & "))", RegexOptions.Multiline Or RegexOptions.Singleline)
        End Sub
    End Class

    Best Regards,


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    Monday, August 12, 2019 5:14 AM