| Description |
Returns the last index of the Needle string in the current (haystack) string.
If not found, then -1 is returned.
The scan is case sensitive.
The scan starts at the end and continues until either the Needle is found, or the string start is passed.
The scan can be forced to commence from the Start character backwards, and can be limited to Count scan characters.
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| | Notes | Very Important : Methods in .Net treat strings as starting at 0, unlike traditional Delphi where they started at 1.
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| Microsoft MSDN Links |
System
System.String
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| A simple example |
program Project1;
{$APPTYPE CONSOLE}
var
strA : String;
result : Integer;
begin
strA := 'ABCDEABCDE';
Console.WriteLine('Guide= 0123456789');
Console.WriteLine('strA = ' + strA);
result := strA.LastIndexOf('AB');
Console.WriteLine('Looking for AB');
Console.WriteLine('Result = ' + result.ToString);
result := strA.LastIndexOf('BA');
Console.WriteLine('Looking for BA');
Console.WriteLine('Result = ' + result.ToString);
Console.ReadLine;
end.
| | Show full unit code | Guide= 0123456789
strA = ABCDEABCDE
Looking for AB
Result = 5
Looking for BA
Result = -1
| | | Specifying a start position | program Project1;
{$APPTYPE CONSOLE}
var
strA : String;
result : Integer;
begin
strA := 'ABCDEABCDE';
Console.WriteLine('Guide= 0123456789');
Console.WriteLine('strA = ' + strA);
result := strA.LastIndexOf('AB', 6);
Console.WriteLine('Looking for AB, starting @ 6');
Console.WriteLine('Result = ' + result.ToString);
result := strA.LastIndexOf('AB', 5);
Console.WriteLine('Looking for AB, starting @ 5');
Console.WriteLine('Result = ' + result.ToString);
Console.ReadLine;
end.
| | Show full unit code | Guide= 0123456789
strA = ABCDEABCDE
Looking for AB, starting @ 6
Result = 5
Looking for AB, starting @ 5
Result = 0
| | | Specifying a start position and limit in the character scan | program Project1;
{$APPTYPE CONSOLE}
var
strA : String;
result : Integer;
begin
strA := 'ABCDEABCDE';
Console.WriteLine('Guide= 0123456789');
Console.WriteLine('strA = ' + strA);
result := strA.LastIndexOf('AB', 9, 4);
Console.WriteLine('Looking for AB, starting @ 9 back for count of 4');
Console.WriteLine('Result = ' + result.ToString);
result := strA.LastIndexOf('AB', 8, 4);
Console.WriteLine('Looking for AB, starting @ 9 back for count of 4');
Console.WriteLine('Result = ' + result.ToString);
result := strA.LastIndexOf('AB', 5, 6);
Console.WriteLine('Looking for AB, starting @ 5 back for count of 6');
Console.WriteLine('Result = ' + result.ToString);
Console.ReadLine;
end.
| | Show full unit code | Guide= 0123456789
strA = ABCDEABCDE
Looking for AB, starting @ 9 back for count of 4
Result = -1
Looking for AB, starting @ 8 back for count of 4
Result = 5
Looking for AB, starting @ 5 back for count of 6
Result = 0
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