Question

我将元素存储在数组中，格式为name#email，我想按名称搜索数组，然后仅输出电子邮件，即#.之后的内容，例如，如果当我按名称Donald搜索时，元素为donald#donald@hotmail.com，输出应为donald@hotmail.com。

我的想法是从长度（名称）中减去长度（字符串）。我怎么最多只算＃个？

Answer 1

To search for the position of a substring in pascal in a string, use the Pos() function.

In your case, the substring would consist of the name plus the # character.

A simple function to extract what comes after the name plus the # would look like:

function ExtractInfo( const searchName,data : String) : String;
var
 p : Integer;
begin
  p := Pos(searchName+'#',data); // Find position of name + '#' in data
  if (p > 0) then
    Result := Copy(data,p+Length(searchName)+1) // Copy after name and `#`
  else
    Result := '';
  // Note 1, if Result is not a valid way to assign the function result, 
  // use ExtractInfo instead.
  // Note 2, if only two parameters are not allowed in your pascal Copy function, 
  // add Length(data) as the third parameter.
end;

To test the function:

WriteLn(ExtractInfo('donald','donald#donald@hotmail.com'));

如何将字符串的一部分计为特定字符？

1 个答案: