Is a number in a string of numbers??

[Ian Branch 127]

Hi Team,

I need to be able to detect and return true or false, if an integer number is in a delimited string of numbers..

i.e.  If the integer is say 47, and the delimited number string is '12;94;128;3;127,147', then it would return False.

      If the integer is say 47, and the delimited number string is '12;94;128;3;127,47', then it would return True.

      If the integer is say 47, and the delimited number string is '12;147;128;3;127,47', then it would return True.

Your thoughts/suggestions appreciated.

 

Regards & TIA,

Ian

[Lajos Juhász 293]

Is the list correct in your example the first numbers are delimited with semicolon while the last is with comma. The easiest way to type this for me is:

 

function ListContains(const PList: string; PNumber: integer): boolean;
var
  sl: TStringList;
begin
  sl:=TStringList.Create;
  try
    sl.Delimiter:=';';
    sl.DelimitedText:=StringReplace(PList, ',', ';', []);
    result:=sl.IndexOf(IntToStr(PNumber))<>-1;

  finally
    sl.Free;
  end;
end;

 

[Ian Branch 127]

Hi Lajos,

7 minutes ago, Lajos Juhász said:

Is the list correct in your example

Interdigital Interface Difficulties.  a.k.a. Finger Fault - It should be ;   :-(

Thank you for the code, I will have at it.

 

Regards,

Ian

[Uwe Raabe 2057]

If you make use of some newer features of the RTL you can also write:

uses
  System.SysUtils, System.StrUtils;

function ListContains(const PList: string; PNumber: integer): boolean;
begin
  Result := MatchStr(PNumber.ToString, PList.Split([';', ',']));
end;

An advantage is the simple support for additional separators.

[0x8000FFFF 22]

\b47\b

https://regex101.com/r/FhA9Hx/1

[Attila Kovacs 629]

 

You did not specify any problems, so these are coming to my mind right now.

 

 

 

 

Edited February 11, 2022 by Attila Kovacs

[Ian Branch 127]

Hi Team,

Thank you for your further suggestions.  I am now going with Uwe's suggestion.

Uwe - I like simple.

0x9000FFFF - regular expressions scare me, like pointers... ;-)

Atilla - Thank you for the pointers.

 

Regards & Tks again,

Ian