比如读取的文本的内容是:aasdj
khkajsdlsdlasdjlsdhaskjdhaskjd
aasdjkhkajsdlsdlasdjlsdhaskjdhaskjd
aasdjkhkajsdlsdlasdjlsdh
askjdhaskjd
aasdjkhkajsdlsdlasdjlsd
haskjdhaskjd
aasdjkhkajsdlsdlasdjlsdhas
kjdhaskjd
aasdjkhkajsdlsdlasdjlsdhaskjdhaskjd
aasdjkhkajsdlsdlasdjlsdha
skjdhaskjdaasdjkhkajsdlsdlasdjlsdhaskjdhaskjdaasd
jkhkajsdlsdlasdjlsdhaskjdhaskjd如上N行,如何取出里面的a
khkajsdlsdlasdjlsdhaskjdhaskjd
aasdjkhkajsdlsdlasdjlsdhaskjdhaskjd
aasdjkhkajsdlsdlasdjlsdh
askjdhaskjd
aasdjkhkajsdlsdlasdjlsd
haskjdhaskjd
aasdjkhkajsdlsdlasdjlsdhas
kjdhaskjd
aasdjkhkajsdlsdlasdjlsdhaskjdhaskjd
aasdjkhkajsdlsdlasdjlsdha
skjdhaskjdaasdjkhkajsdlsdlasdjlsdhaskjdhaskjdaasd
jkhkajsdlsdlasdjlsdhaskjdhaskjd如上N行,如何取出里面的a
最后trim一下就好了
function DeleteSubStr(ASub, AStr :string):string;
var
_index :Integer;
_TempStr :string;
_SubLength :Integer;
begin
Result := '';
if AStr = '' then
Exit;
_SubLength := Length(ASub);
_index := Pos(ASub, AStr);
while _index > 0 do
begin
_TempStr := Copy(AStr, 1, _index - 1);
AStr := Copy(AStr, _index + _SubLength, Length(AStr) - (_index + (_SubLength - 1)));
AStr := _TempStr + AStr;
_index := Pos(ASub, AStr);
end;
Result := AStr;
end;说明:ASub可任意长度,但区分大小写
调用:Edit2.Text:= deleteSubStr('a', '1aa2aaa3aa4aaaa');
结果为:1234