Question

How to replace the first occurrence of a substring in a string with VB.NET

Answer 1

Imports System

Class Program
    Public Shared Sub Main()
        Dim s As String = "aa bb cc dd ee cc"
		
        Dim result As String = ReplaceFirst(s, "cc", "YY")
		
        Console.WriteLine(result)
    End Sub

    Private Shared Function ReplaceFirst(ByVal input As String, ByVal search As String, ByVal replace As String) As String
        Dim index As Integer = input.IndexOf(search)
		
        If index < 0 Then Return input
			
        Return input.Substring(0, index) & replace & input.Substring(index + search.Length)
    End Function
End Class



' run:
'
' aa bb YY dd ee cc
'

 

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