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Categories / Delphi / Strings

 

Check a String for a Valid Email Address

Title: check a String for a Valid Email Address? function MailURLMayBeInvalid(const s: string): Boolean; var i: Integer; c: string; begin // ' ', ä, ö, ü, ß, [, ], (, ), : in EMail-Address Result := (Trim(s) = '') or (Pos(' ', AnsiLowerCase(s)) 0) or (Pos('ä', AnsiLowerCase(s)) 0) or (Pos('ö', AnsiLowerCase(s)) 0) or (Pos('ü', AnsiLowerCase(s)) 0) or (Pos('ß', AnsiLowerCase(s)) 0) or (Pos('[', AnsiLowerCase(s)) 0) or (Pos(']', AnsiLowerCase(s)) 0) or (Pos('(', AnsiLowerCase(s)) 0) or (Pos(')', AnsiLowerCase(s)) 0) or (Pos(':', AnsiLowerCase(s)) 0); if Result then Exit; // @ not in EMail-Address; i := Pos('@', s); Result := (i = 0) or (i = 1) or (i = Length(s)); if Result then Exit; Result := (Pos('@', Copy(s, i + 1, Length(s) - 1)) 0); if Result then Exit; // Domain c := Copy(s, i + 1, Length(s)); Result := Length(c) if Result then Exit; i := Pos('.', c); Result := (i = 0) or (i = 1) or (i = Length(c)); end;