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Strings.InStrRev Method

Returns the position of the first occurrence of one string within another, starting from the right side of the string.

Namespace:  Microsoft.VisualBasic
Assembly:  Microsoft.VisualBasic (in Microsoft.VisualBasic.dll)

public static int InStrRev(
	string StringCheck,
	string StringMatch,
	int Start,
	CompareMethod Compare


Type: System.String

Required. String expression being searched.

Type: System.String

Required. String expression being searched for.

Type: System.Int32

Optional. Numeric expression setting the one-based starting position for each search, starting from the left side of the string. If Start is omitted then –1 is used, meaning the search begins at the last character position. Search then proceeds from right to left.

Type: Microsoft.VisualBasic.CompareMethod

Optional. Numeric value indicating the kind of comparison to use when evaluating substrings. If omitted, a binary comparison is performed. See Settings for values.

Return Value

Type: System.Int32
If StringCheck is zero-length, InStrRev returns 0. If StringMatch is zero-length, InStrRev returns Start. If StringMatch is not found, InStrRev returns 0. If StringMatch is found within StringCheck, InStrRev returns position at which the first match is found, starting with the right side of the string. If Start is greater than length of StringMatch, InStrRev returns 0.

For more detailed information, see the Visual Basic topic InStrRev Function (Visual Basic).

Note that the syntax for the InStrRev function is not the same as the syntax for the InStr function.

The Compare argument can have the following values.




Performs a binary comparison.


Performs a textual comparison.

This example demonstrates the use of the InStrRev function.

Dim TestString As String = "the quick brown fox jumps over the lazy dog" 
Dim TestNumber As Integer 
' Returns 32.
TestNumber = InStrRev(TestString, "the")
' Returns 1.
TestNumber = InStrRev(TestString, "the", 16)

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

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