Strings::InStrRev Method (String^, String^, Int32, CompareMethod)
Returns the position of the first occurrence of one string within another, starting from the right side of the string.
Assembly: Microsoft.VisualBasic (in Microsoft.VisualBasic.dll)
public: static int InStrRev( String^ StringCheck, String^ StringMatch, int Start = -1, CompareMethod Compare = CompareMethod::Binary )
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::Int32If | 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 |
| Exception | Condition |
|---|---|
| ArgumentException | 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.
Constant | Description |
Binary | Performs a binary comparison. |
Text | 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)
Available since 1.1
Silverlight
Available since 2.0