Delphi - extract string between tags (duplicate tags) -


i'm trying write function extract string between 2 tags. problem first tag duplicate in string unknown count e.g.

str := 'delphi app hello hello sometext here hello hello hello test!';

what want extract hello test!

  • tagf last hello word
  • tagl test!

the duplicate count of tagf random.

function sextractbetweentagsb(const s, lasttag, firsttag: string): string; var   i, f : integer;   stemp : string; begin   stemp := s;   repeat     delete(stemp,pos(firsttag, stemp),length(firsttag));   until ansipos(firsttag,stemp) = 0;   f := pos(lasttag, stemp);   result:= firsttag+' '+copy(stemp, 1, length(stemp)); end;

the output is:

hello delphi app   sometext here    test! 

function sextractbetweentagsb(const s, lasttag, firsttag: string): string; var   plast,pfirst,pnextfirst : integer; begin   pfirst := pos(firsttag,s);   plast := pos(lasttag,s);   while (plast > 0) , (pfirst > 0) begin     if (pfirst > plast) // find next lasttag       plast := posex(lasttag,s,plast+length(lasttag))     else     begin       pnextfirst := posex(firsttag,s,pfirst+length(firsttag));       if (pnextfirst = 0) or (pnextfirst > plast) begin         result := copy(s,pfirst,plast-pfirst+length(lasttag));         exit;       end       else         pfirst := pnextfirst;     end;   end;   result := ''; end;  var   s: string;  begin   s := 'delphi app hello hello sometext here hello hello hello test! hello';   writeln(sextractbetweentagsb(s,'test','hello')); end.

output:

hello test

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