Gemstone Common Library
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# StringExtensionsIndexOfPreviousNot(String, Char, Int32) Method

Searches a string from right to left for the next instance of a character that is not contained in the specified collection of characters.

## Definition

Namespace: Gemstone.StringExtensions
Assembly: Gemstone.Common (in Gemstone.Common.dll) Version: 1.0.173 -- Release Build+298e1c238b074757f82f41812034645402a162ed
C#
View Source Request Example

    public static int IndexOfPreviousNot(
    	this string? value,
    	char[]? anyOf,
    	int startIndex = 0
    )

VB
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    <ExtensionAttribute>
    Public Shared Function IndexOfPreviousNot (
    	value As String,
    	anyOf As Char(),
    	Optional startIndex As Integer = 0
    ) As Integer

C++
View Source Request Example

    public:
    [ExtensionAttribute]
    static int IndexOfPreviousNot(
    	String^ value,
    	array<wchar_t>^ anyOf,
    	int startIndex = 0
    )

JavaScript
View Source Request Example

    Gemstone.StringExtensions.StringExtensions.IndexOfPreviousNot = function(value, anyOf, startIndex);

#### Parameters

value String
  Input string to process.
anyOf Char
  The characters to use to test find.
startIndex Int32 (Optional)
  The index in value from which to begin looking for characters not in anyOf. Typically length of value minus 1."

#### Return Value

Int32
The index of the character within value or (-1) if not found.

#### Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type String. When you use instance method syntax to call this method, omit the first parameter. For more information, see Extension Methods (Visual Basic) or Extension Methods (C# Programming Guide).

## See Also

#### Reference

StringExtensions Class
IndexOfPreviousNot Overload
Gemstone.StringExtensions Namespace