delphi 根据特殊符号字符获取字符串前或后的字符

function GetBefore(substr, str:string):string;
{©Drkb v.3(2007): www.drkb.ru,
®Vit (Vitaly Nevzorov) - nevzorov@yahoo.com}
begin
if pos(substr,str)> then
  result:=copy(str,,pos(substr,str)-)
else
  result:='';
end;
 
function GetAfter(substr, str:string):string;
{©Drkb v.3(2007): www.drkb.ru,
®Vit (Vitaly Nevzorov) - nevzorov@yahoo.com}
begin
if pos(substr,str)> then
  result:=copy(str,pos(substr,str)+length(substr),length(str))
else
  result:='';
end;
 
演示:
 
)
GetBefore('-', 'Total-2.00$') // 结果 "Total"
 
)
GetAfter('-', 'Total-2.00$') // 结果 "2.00$"
 
)
GetBefore('$',GetAfter('-', 'Total-2.00$ (общая сумма)')  // 结果 "2.00"