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String.LastIndexOfAny Method (Char(), Int32)

Reports the index position of the last occurrence in this instance of one or more characters specified in a Unicode array. The search starts at a specified character position.

Namespace:  System
Assembly:  mscorlib (in mscorlib.dll)

'Declaration
Public Function LastIndexOfAny ( _
	anyOf As Char(), _
	startIndex As Integer _
) As Integer
'Usage
Dim instance As String 
Dim anyOf As Char()
Dim startIndex As Integer 
Dim returnValue As Integer 

returnValue = instance.LastIndexOfAny(anyOf, _
	startIndex)

Parameters

anyOf
Type: System.Char()

A Unicode character array containing one or more characters to seek.

startIndex
Type: System.Int32

The search starting position.

Return Value

Type: System.Int32
The index position of the last occurrence in this instance where any character in anyOf was found; otherwise, -1 if no character in anyOf was found or if the current instance equals String.Empty.

ExceptionCondition
ArgumentNullException

anyOf is Nothing.

ArgumentOutOfRangeException

The current instance does not equal String.Empty and startIndex specifies a position not within this instance.

Index numbering starts from zero.

This method begins searching at the startIndex character position of this instance and proceeds backward toward the beginning until either a character in anyOf is found or the first character position has been examined. The search is case-sensitive.

This method performs an ordinal (culture-insensitive) search, where a character is considered equivalent to another character only if their Unicode scalar values are the same. To perform a culture-sensitive search, use the CompareInfo.LastIndexOf method, where a Unicode scalar value representing a precomposed character, such as the ligature 'Æ' (U+00C6), might be considered equivalent to any occurrence of the character's components in the correct sequence, such as "AE" (U+0041, U+0045), depending on the culture.

The following example finds the index of the last occurrence of any character in the string "is" within a substring of another string.

' Sample for String.LastIndexOfAny(Char[], Int32) 
Imports System
 _

Class Sample

   Public Shared Sub Main()

      Dim br1 As String = "0----+----1----+----2----+----3----+----4----+----5----+----6----+-" 
      Dim br2 As String = "0123456789012345678901234567890123456789012345678901234567890123456" 
      Dim str As String = "Now is the time for all good men to come to the aid of their party." 
      Dim start As Integer 
      Dim at As Integer 
      Dim target As String = "is" 
      Dim anyOf As Char() = target.ToCharArray()

      start =(str.Length - 1) / 2
      Console.WriteLine("The last character occurrence  from position {0} to 0.", start)
      Console.WriteLine("{1}{0}{2}{0}{3}{0}", Environment.NewLine, br1, br2, str)
      Console.Write("A character in '{0}' occurs at position: ", target)

      at = str.LastIndexOfAny(anyOf, start)
      If at > - 1 Then
         Console.Write(at)
      Else
         Console.Write("(not found)")
      End If
      Console.Write("{0}{0}{0}", Environment.NewLine)
   End Sub 'Main
End Class 'Sample

'This example produces the following results: 
'The last character occurrence  from position 33 to 0. 
'0----+----1----+----2----+----3----+----4----+----5----+----6----+- 
'0123456789012345678901234567890123456789012345678901234567890123456 
'Now is the time for all good men to come to the aid of their party. 

'A character in 'is' occurs at position: 12 


'

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 3.5, 2.0, 1.0

XNA Framework

Supported in: 3.0, 2.0, 1.0

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