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Copiar até um determinado elemento da string


Kadov
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Podes generalizar a coisa com uma funçãozita não-recursiva, para conseguires entender:

(só precisas da Function CadeiaAte. O resto é contexto de uma ConsoleApp, para teres a "full picture")

Module Module1

   Sub Main()
       Dim cadeia As String = "AbcAbcAbcCde"
       Console.WriteLine(CadeiaAte(cadeia, "c", 3))
       Console.ReadKey()
   End Sub

   Public Function CadeiaAte(cadeia As String, caractere As String, repeticao As Integer)
       If cadeia.ToCharArray().Count(Function(c) c = "c") < repeticao Then
           Return cadeia
       End If
       Dim Resultado As String = String.Empty
       For Each c As Char In cadeia.ToCharArray()
           If repeticao = 0 Then Exit For
           If c.ToString() = caractere Then repeticao -= 1
           Resultado &= c.ToString()
       Next
       Return Resultado
   End Function

End Module

Se usares muito até podes fazer uma extensão para a classe String, que depois usas directamente nas strings, por exemplo:

Dim cadeia As String = "AbcAbcAbcCde"
cadeia.CadeiaAte("c",3)
  • Vote 1

Sérgio Ribeiro


"Great coders aren't born. They're compiled and released"
"Expert coders do not need a keyboard. They just throw magnets at the RAM chips"

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