Strings.InStrRev(String, String, Int32, CompareMethod) Method

Reference

Definition

Namespace:: Microsoft.VisualBasic

Assembly:: Microsoft.VisualBasic.Core.dll

Assembly:: Microsoft.VisualBasic.dll

Source:: Strings.vb

Source:: Strings.vb

Source:: Strings.vb

Important

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

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

public static int InStrRev (string? StringCheck, string? StringMatch, int Start = -1, Microsoft.VisualBasic.CompareMethod Compare = Microsoft.VisualBasic.CompareMethod.Binary);

public static int InStrRev (string StringCheck, string StringMatch, int Start = -1, Microsoft.VisualBasic.CompareMethod Compare = Microsoft.VisualBasic.CompareMethod.Binary);

static member InStrRev : string * string * int * Microsoft.VisualBasic.CompareMethod -> int

Public Function InStrRev (StringCheck As String, StringMatch As String, Optional Start As Integer = -1, Optional Compare As CompareMethod = Microsoft.VisualBasic.CompareMethod.Binary) As Integer

Parameters

StringCheck: String

Required. String expression being searched.

StringMatch: String

Required. String expression being searched for.

Start: 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: 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.

Returns

Int32

If	InStrRev returns
`StringCheck` is zero-length	0
`StringMatch` is zero-length	`Start`
`StringMatch` is not found	0
`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`	0

Exceptions

ArgumentException

Start = 0 or Start < -1.

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)

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.

Applies to

Jaa