fix: fix text node hints and support regex selector.

[alps2006]

No description provided.

[brookhong]

Please describe the issue to be fixed in details and with steps to reproduce.

[alps2006]

const textAnchorPat = /(^[\n\r\s]*\S{3,}|\b\S{4,})/g;

1. Fix creating hints by regex.

  api.Hints.create(textAnchorPat, function (element) {
    
  });

2. Fix element callback for text element.

  api.Hints.create(textAnchorPat, function (element) {
    
  });