问Delphi:计算一个字符串在另一个字符串中出现的次数

EN

function Occurrences(const Substring, Text: string): integer;
var
  offset: integer;
begin
  result := 0;
  offset := PosEx(Substring, Text, 1);
  while offset <> 0 do
  begin
    inc(result);
    offset := PosEx(Substring, Text, offset + length(Substring));
  end;
end;

{ Returns a count of the number of occurences of SubText in Text }
function CountOccurences( const SubText: string;
                          const Text: string): Integer;
begin
  if (SubText = '') OR (Text = '') OR (Pos(SubText, Text) = 0) then
    Result := 0
  else
    Result := (Length(Text) - Length(StringReplace(Text, SubText, '', [rfReplaceAll]))) div  Length(subtext);
end;  { CountOccurences }

uses
  StrUtils;    

function Occurrences(const Substring, Text: string;
  const ignoreUppercase: Boolean = false): Integer;
var
  inSubstring, inText: string;
  inPos: Integer;
begin
  Result:= 0;

  if (Substring = '') or (Text = '') then
    Exit;

  if ignoreUppercase then
  begin
    inSubstring:= AnsiLowerCase(Substring);
    inText:=  AnsiLowerCase(Text);
  end
  else
  begin
    inSubstring:= Substring;
    inText:=  Text;
  end;

  inPos:= 1;

  repeat
    inPos:= posEx(inSubstring, inText, inPos);
    if inPos > 0 then
    begin
      Inc(Result);
      inPos:= inPos + Length(inSubstring);
    end;
  until inPos = 0;
end;