[SOLVED] The return value of Pos - what is the index value a measure of?

[Gizmo]

Pos "returns the index of Substr in S, if S contains Substr".

http://www.freepascal.org/docs-html/rtl/system/pos.html

So, if

FoundAt := IntToStr(Pos('I am looking for', String));

returns a hit reported as "11", what does that mean? It obviously means "Index 11" but I don't understand what the index is a count of? 11 lines? 11 bytes? Offset 11 as decimal?

Many thanks

Ted

[User137]

Code: [Select]

var s: string;
begin
  s:='I am looking for';
  //s[11] would be "n", or same as copy(s, 11, 1)
end;It means 11th byte (or char type) in string.

But note that string is UTF8 encoded, some 1 special character may take even 4 bytes on its own. For those cases there are UTF8Pos() and other functions.

[Gizmo]

I feel like an idiot. That was a question of utter stupidity. If I had spent 5 seconds thinking about it I would have just used a ShowMessage to show 'String' and I'd have realised it was the 11th value. Index...as in String[0..XX]....yeah. Sory for wasting your time and thanks for the explanation.

[Leledumbo]

It obviously means "Index 11" but I don't understand what the index is a count of? 11 lines? 11 bytes? Offset 11 as decimal?

11 as in "11th character of the string"

[User137]

I feel like an idiot. That was a question of utter stupidity. If I had spent 5 seconds thinking about it I would have just used a ShowMessage to show 'String' and I'd have realised it was the 11th value. Index...as in String[0..XX]....yeah. Sory for wasting your time and thanks for the explanation.

Krhm... String[1..XX]