String.LastIndexOfAny Method (Char())
Reports the zero-based index position of the last occurrence in this instance of one or more characters specified in a Unicode array.
Assembly: mscorlib (in mscorlib.dll)
Parameters
- anyOf
-
Type:
System.Char()
A Unicode character array containing one or more characters to seek.
Return Value
Type: System.Int32The index position of the last occurrence in this instance where any character in anyOf was found; -1 if no character in anyOf was found.
| Exception | Condition |
|---|---|
| ArgumentNullException | anyOf is null. |
Index numbering starts from zero.
This method begins searching at the last 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 another string.
' Sample for String.LastIndexOfAny(Char[]) 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 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) 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 66 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: 58 ' ' '
Available since 8
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1