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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


InStrRev returns

StringCheck is zero-length


StringMatch is zero-length


StringMatch is not found


StringMatch is found within StringCheck

Position at which the first match is found, starting with the right side of the string.

Start is greater than length of StringMatch



Start = 0 or Start < -1.

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)

.NET Framework

Supported in: 4.5.1, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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

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