Articolo
11/18/2011

Strings.InStrRev Method

Microsoft Silverlight will reach end of support after October 2021. Learn more.

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)

Syntax

'Declaration
Public Shared Function InStrRev ( _
    StringCheck As String, _
    StringMatch As String, _
    Start As Integer, _
    Compare As CompareMethod _
) As Integer

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

Parameters

StringCheck
Type: System.String
Required. String expression being searched.

StringMatch
Type: System.String
Required. String expression being searched for.

Start
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.

Compare
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.

Remarks

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.

Constant	Description
Binary	Performs a binary comparison.
Text	Performs a textual comparison.

Examples

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)

Version Information

Silverlight

Supported in: 5, 4, 3

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

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