How to select single word in URL in iOS 13?
Double tap on that word.

https://www.idownloadblog.com/2019/06/14/ios-13-overview-text-editing-gestures/ says:


  
  Select a word: double-tap on it.
  Select a sentence: tap on the text with three fingers.
  Select a paragraph: tap on the text with four fingers.
  Bubble menu: bring up the shortcuts menu by tapping once with three fingers.
  Select multiple contiguous items: tap with two fingers, then drag to quickly select emails, files and folders.