Determine if string not contain number - delphi

Question

I need a little help with a function. What I need to do is determine, if a string contains a number or not. If yes, I need only a number from the string, if not I need a whole word from it.
For example:
If my string is 'xyz 60', I need '60' from it, but if the string is 'xyz', I need the whole string:
function TForm1.FindNumberInString(InString: string): TNumberInString;
var
i, j: Integer;
ST: String;
begin
Result.TNumber := '';
Result.TIsNumber := False;
for i := 1 to Length(InString) do
begin
if (InString[i] in ['0'..'9']) then
begin
Result.TNumber := Result.TNumber + InString[i];
Result.TIsNumber := True;
end else
Result.TNumber := InString;
end;
end;
// TNumberInString is a packed record
TNumberInString = Packed Record
TNumber: string;
TIsNumber: boolean;
end;
Anyone can help what will be the problem? The Result is always 'xyz60', not '60'. I tried "if not (InString[i] in...), but it did not work, too.

Answer 1

Try something more like this instead:
function TForm1.FindNumberInString(InString: string): TNumberInString;
var
i, j: Integer;
begin
Result.TNumber := InString;
Result.TIsNumber := False;
for i := 1 to Length(InString) do
begin
if InString[i] in ['0'..'9'] then
begin
Result.TNumber := InString[i];
Result.TIsNumber := True;
For j := i+1 to Length(InString) do
begin
if not (InString[i] in ['0'..'9']) then
Break;
Result.TNumber := Result.TNumber + InString[j];
end;
Exit;
end;
end;
end;

Answer 2

I would use a Regular Expressions, and extend your record with a constructor
uses
RegularExpressions;
{$R *.dfm}
type
TNumberInString = Packed Record
TNumber: string;
TIsNumber: Boolean;
constructor Create(const Value: String);
end;
{ TNumberInString }
constructor TNumberInString.Create(const Value: String);
var
Match: TMatch;
begin
Match := TRegEx.Create('\d+').Match(Value);
TIsNumber := Match.Success;
if TIsNumber then
TNumber := Match.Value
else
TNumber := Value;
end;
Then only thing left is to call it:
procedure TForm30.FormCreate(Sender: TObject);
begin
Memo1.Lines.Clear;
Memo1.Lines.Add(TNumberInString.Create('XYZ').TNumber);
Memo1.Lines.Add(TNumberInString.Create('XYZ60').TNumber);
Memo1.Lines.Add(TNumberInString.Create('XYZ 60').TNumber);
end;
And show the result: