LastIndexOfAny Method (Char[], Int32)
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String.LastIndexOfAny Method (Char(), Int32)

[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]

Reports the zero-based 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 and proceeds backward toward the beginning of the string.

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

Public Function LastIndexOfAny ( _
	anyOf As Char(), _
	startIndex As Integer _
) As Integer


Type: System.Char ()
A Unicode character array containing one or more characters to seek.
Type: System.Int32
The search starting position. The search proceeds from startIndex toward the beginning of this instance.

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.


anyOf is Nothing.


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)

Class Example

   Public Shared Sub Demo(ByVal outputBlock As System.Windows.Controls.TextBlock)

      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
      outputBlock.Text += String.Format("The last character occurrence  from position {0} to 0.", start) & vbCrLf
      outputBlock.Text += String.Format("{1}{0}{2}{0}{3}{0}", Environment.NewLine, br1, br2, str) & vbCrLf
      outputBlock.Text += String.Format("A character in '{0}' occurs at position: ", target)

      at = str.LastIndexOfAny(anyOf, start)
      If at > -1 Then
         outputBlock.Text &= at
         outputBlock.Text &= "(not found)"
      End If
      outputBlock.Text += String.Format("{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.
'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 Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0

Windows Phone

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