Question

I have a problem when I use TRegEx with a case insensitive Regex string. The Regex does not match anything.

My regex:

'/stream_map=(.[^&]*?)&/i'

source:

procedure TForm1.Button1Click(Sender: TObject);
var 
    regex : TRegEx;
    exper : string;
    fmatch : TMatchCollection;
    example: string;
begin
    example := 'Stream_Map=TestMatch&' 
    exper := '/stream_map=(.[^&]*?)&/i';
    regex := TRegEx.Create(exper);
    fmatch := regex.Matches(example);
    ShowMessage(IntToStr(fmatch.Count));
end;

The matches count shows "0" .

Answer 1

It looks to me as though you are using the wrong syntax for your regex.

'/stream_map=(.[^&]*?)&/i'

looks like Perl regex syntax.

For Delphi’s TRegEx you need to remove the slash delimiters and specify case insensitivity through an options parameter. Like this:

regex := TRegEx.Create('stream_map=(.[^&]*?)&', [roIgnoreCase]);