Delphi stringlist finding negative keyword in list - delphi

Question

I have two string lists that I'm working with. One that has a list of keywords, and then another that has a list of negative keywords. I want to be able to search through the list and pick out the list items that do not contain the negative keyword and output to a third keyword list. I was using the AnsiPos function but that found the negative keywords if they were part of a word, vs full word.
Any suggestions on a relatively easy way to do this? Speed is not that important, but would be nice.
Example of what I'm looking to do:
Keyword List:
Cat
Catfish
Fish Sticks
Dog Food
Negative Keyword List:
Fish
Returned Values Wanted:
Cat
Catfish
Dog Food
This is what I've got so far.. which does not work. I used information from: Is There An Efficient Whole Word Search Function in Delphi?
function ExistWordInString(aString: PAnsichar; aSearchString: string;
aSearchOptions: TStringSearchOptions): Boolean;
var
Size : Integer;
begin
Size := StrLen(aString);
result := SearchBuf(aString, Size, 0, 0, aSearchString, aSearchOptions) <> nil;
end;
procedure TForm2.Button1Click(Sender: TObject);
var
i, j, index: integer;
s: string;
stl: tstringlist;
begin
stl := TStringList.Create;
stl.Text := listbox1.Items.Text;
for I := 0 to stl.Count - 1 do
begin
for j := 0 to listbox2.Count - 1 do
begin
if not ExistWordInString(PAnsiChar(listbox2.Items.Strings[j]),
listbox1.Items.Strings[i], [soWholeWord, soDown])
then
listbox3.Items.Append(stl.Strings[i]);
end;
end;
end;

Answer 1

If spaces are the only word delimiter you need to worry about, then you can do a whole word match using AnsiPos by adding a space before and after both the keyword and the negative keyword, ie
AnsiPos(' '+SubStr+' ', ' '+Str+' ')
You'd need a loop to check every entry from the negative keyword list.

Answer 2

this sample code works like a charm (using Delphi 7):
unit Unit1;
interface
uses
Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
StdCtrls, StrUtils;
type
TForm1 = class(TForm)
Button1: TButton;
ListBox1: TListBox;
ListBox2: TListBox;
ListBox3: TListBox;
procedure Button1Click(Sender: TObject);
private
function ExistWordInString(aString, aSearchString:string;aSearchOptions: TStringSearchOptions): Boolean;
public
end;
var
Form1: TForm1;
implementation
{$R *.DFM}
procedure TForm1.Button1Click(Sender: TObject);
var
i,k: integer;
begin
for k:= 0 to ListBox2.Count -1 do
for i:= 0 to ListBox1.Count - 1 do
begin
if not ExistWordInString(ListBox1.Items[i], ListBox2.Items[k],[soWholeWord,soDown]) then
ListBox3.Items.Append(ListBox1.Items[i]);
end;
end;
function TForm1.ExistWordInString(aString, aSearchString: string; aSearchOptions: TStringSearchOptions): Boolean;
var
Size : Integer;
begin
Size:=Length(aString);
Result := SearchBuf(PChar(aString), Size, 0, 0, aSearchString, aSearchOptions)<>nil;
end;
end.
and here's the form:
object Form1: TForm1
Left = 1008
Top = 398
Width = 411
Height = 294
Caption = 'Form1'
Color = clBtnFace
Font.Charset = DEFAULT_CHARSET
Font.Color = clWindowText
Font.Height = -11
Font.Name = 'Tahoma'
Font.Style = []
OldCreateOrder = False
PixelsPerInch = 96
TextHeight = 13
object Button1: TButton
Left = 320
Top = 8
Width = 75
Height = 25
Caption = 'Button1'
TabOrder = 0
OnClick = Button1Click
end
object ListBox1: TListBox
Left = 8
Top = 8
Width = 177
Height = 97
ItemHeight = 13
Items.Strings = (
'Cat '
'Catfish'
'Fish Sticks'
'Dog Food')
TabOrder = 1
end
object ListBox2: TListBox
Left = 192
Top = 8
Width = 121
Height = 97
ItemHeight = 13
Items.Strings = (
'Fish')
TabOrder = 2
end
object ListBox3: TListBox
Left = 8
Top = 112
Width = 305
Height = 137
ItemHeight = 13
TabOrder = 3
end
end
hope this helps.
Reinhard :-)

Answer 3

I think I figured it out. Use stringlist.find('fish',index);
I didn't figure it out. .find did not work.
-Brad

Answer 4

You can use the SearchBuf function (see the pastacool's answer) IF you are not interested in other characters except A..Z / Unicode.
If you have an Unicode Delphi (D2009 or D2010) then you must use TCharacter.IsLetterOrDigit(aString: string; aIndex: integer): boolean; from the Character unit. A simple example for you to get the idea:
procedure TForm7.btn1Click(Sender: TObject);
var
bMatches: boolean;
begin
with rgx1 do //custom component - disregard it
begin
RegEx:=edtTextToFind.Text; //text to find
Subject:=mmoResult.Text; //text in which to search
if Match then //aha! found it!
begin
bMatches:=True;
if chkWholeWord.Checked then //be attentive from here!! - I think that's self explaining...
begin
if MatchedExpressionOffset>1 then
bMatches:=not TCharacter.IsLetterOrDigit(Subject, MatchedExpressionOffset-1);
if bMatches and (MatchedExpressionOffset+MatchedExpressionLength<=Length(Subject)) then
bMatches:=not TCharacter.IsLetterOrDigit(Subject, MatchedExpressionOffset+MatchedExpressionLength);
end;
if bMatches then //select it in the memo
begin
mmoResult.SelStart:=MatchedExpressionOffset-1;
mmoResult.SelLength:=MatchedExpressionLength;
mmoResult.SetFocus;
end
else
ShowMessage('Text not found!');
end
else
ShowMessage('Text not found!');
end;
end;

Answer 5

Change your function to read:
function ExistWordInString(aString:PAnsichar;
aSearchString:string;
aSearchOptions: TStringSearchOptions): Boolean;
var
b : boolean;
begin
if soWholeWord in aSearchOptions then
b := Pos(' '+Uppercase(aSearchString)+' ',' '+UpperCase(aString)+' ') > 0;
else
b := Pos(UpperCase(aSearchString),UpperCase(aString)) > 0;
Result := b;
end;
If your using Delphi 2009/2010 then change it from Pos to AnsiPos. My assumption here is that soWholeWord means that the match "Fish" would match "Fish Sticks" but not "catfish".