Delphi的StringReplace

您使用StringReplace這個funciotn試試看。
type
    TReplaceFlags = set of (rfReplaceAll, rfIgnoreCase);

function StringReplace(const S, OldPattern, NewPattern: string; Flags: TReplaceFlags): string;

rfReplaceAll：全部置換
rfIgnoreCase：勿略大小寫

For Example：

var
    aStr: String;
begin
    aStr := 'This is a book, not a pen!';
    ShowMessage(StringReplace(aStr, 'a', 'two', []));//變為This is two book, not a pen!只替換了第一個符合的字
    ShowMessage(StringReplace(aStr, 'a', 'two', [rfReplaceAll]));//變為This is two book, not two pen!替換了所有符合的字
    aStr := 'This is a book, not A pen!';
    ShowMessage(StringReplace(aStr, 'a', 'two', [rfReplaceAll]));//變為This is two book, not A pen!只替換了符合的字(小寫a)
    ShowMessage(StringReplace(aStr, 'a', 'two', [rfReplaceAll, rfIgnoreCase]));//變為This is two book, not two pen!不管大小寫替換了所有符合的字
end;