VB.NET InStrRev() – Code Sample Syntax Example

VB.NET InStrRev Example – Code Sample Syntax

Abstract: – Illustrates using .

 *** 1. Download Source Code *** 

VB.NET Syntax StringManipulation InStrRev download Download Source Code for All VB Console Examples in One Project

 *** 2. InStrRev Syntax *** 


Purpose:
returns integer of the position of the first occurrence of one string
within another, starting from the right side of the string. If the string is
not found, the result is 0


Syntax:
InStrRev(stringToSearch,stringToFind,startIndex,compareMethod)

Parameters Description
stringToSearch Required – string that you want to search
stringToFind Required – string that you are trying to
find into parameter2
startIndex Optional. Numeric expression setting the
one-based starting position for each search, starting from the
left side of the string. If Start is omitted then –1 is used,
meaning the search begins at the last character position.
Search then proceeds from right to left.
comparemethod Optional – integer indicating binary or text

Result Data Type Description
integer returns integer of the position of the first occurrence
of one string within another, starting from the right side of the
string. If the string is not found, the result is 0


 *** 3. InStrRev – Quick Example *** 

Dim strString1 As String = “Hello World”
Console.WriteLine(InStrRev(strString1, “l”).ToString()) ‘Returns 10

 *** 4. InStrRev – Full Example *** 

InStrRev Example Output Screenshot


VB.NET Syntax StringManipulation InStrRev screenshot


Step 1: Click Visual Basic to Cut-n-paste code into clsInStrRev.vb

Public Class clsInStrRev
 
    Public Sub Main()
 
        '****************************************************************************************
        ' Purpose:  returns integer of the position of the first occurrence of one string 
        ' within another, starting from the right side of the string. If the string is 
        ' not found, the result is 0
        '
        ' Syntax: 	InStrRev(stringToSearch,stringToFind,startIndex,compareMethod)
        '
        ' Parameter1: stringToSearch - Required - string that you want to search
        '
        ' Parameter2: stringToFind - Required - string that you are trying to 
        ' find into parameter2
        '
        ' Parameter3: startIndex - Optional.  Numeric expression setting the 
        ' one-based starting position for each  search, starting from the 
        ' left side of the string. If Start is omitted then –1 is used, 
        ' meaning the search begins at the last character position. 
        ' Search then proceeds from right to left.
        '
        ' Parameter4: comparemethod - Optional - integer indicating binary or text
        '        
        ' Result: integer - returns integer of the position of the first occurrence 
        ' of one string within another, starting from the right side of the 
        ' string. If the string is not found, the result is 0
        '
        ' Quick Example:  Dim strString1 As String = "Hello World"
        '    Console.WriteLine(InStrRev(strString1, "l").ToString()) 'Returns 10
        '
        '****************************************************************************************
 
 
        Console.WriteLine("Example #1: 	InStrRev(stringcheck,stringmatch,start,comparemethod) ")
 
        Dim strString1 As String = "Hello World"
 
 
        Console.WriteLine(InStrRev(strString1, "l").ToString()) 'Returns 10
        Console.WriteLine(InStrRev(strString1, "x").ToString()) 'Returns 0 because not found
 
 
        'write blank line to make output easier to read
        Console.WriteLine()
 
 
 
        'Prevent console from closing before you press enter
        Console.ReadLine()
 
    End Sub
 
 
End Class

Step 2: Click Visual Basic to Cut-n-paste code into Module1.vb

Module Module1
 
    Sub Main()
 
 
        Dim myclsInStrRev As New clsInStrRev
        myclsInStrRev.Main()
 
 
 
    End Sub
 
End Module

Prerequistes:

  1. Install Visual Basic (Express or Standard Edition)
  2. Install SQL Server Express
  3. Download Northwind and pubs Database
  4. Attach Northwind Database to Databases in Sql Express
  5. Attach pubs Database to Databases in Sql Express

Notes:

  • Console Application is used to simplify things, but Windows Forms or Web Forms could also be used
  • You can build a library of syntax examples by using same project over and over and just commenting out what you do not want to execute in Module1.vb

Instructions:
VB.NET Syntax StringManipulation InStrRev

  1. Use Visual Basic 2010 Express or Standard Edition
  2. Create new project;
    • Click File/New Project
    • Select Console Application Template
    • Select Visual Basic for Language
    • name of project could be VBNET_Syntax.
  3. Add New folder named “StringManipulation”
    • Right-click project name in solution explorer;
    • add new folder;
    • name of folder could be: StringManipulation
  4. Add Class Named clsInStrRev to StringManipulation folder
    • Right-click StringManipulation folder;
    • add new item;
    • Select class
    • Class name could be clsInStrRev
  5. Click on Visual Basic in code in step 1 above to copy code into clsInStrRev.vb
  6. Click on Visual Basic in code in step 2 above to copy code into Module1.vb
  7. Click green arrow or press F5 to run program