input: Write a function to extract and print the titles of all YouTube videos from a given URL using Python. The function should use the `requests` library to fetch the webpage content and `re` module to find the titles. The titles should be found using a regular expression that matches the video title between `<a href="/watch\?v=([^"]+)">` and `</a>` tags.
  assert get_youtube_titles("https://www.youtube.com/user/Thexvid/videos")==["[VIDEO TITLE 1]", "[VIDEO TITLE 2]", ...]
  assert get_youtube_titles("https://www.youtube.com/user/AnotherChannel/videos")==["[VIDEO TITLE 1]", "[VIDEO TITLE 2]", ...]
  assert get_youtube_titles("https://www.youtube.com/user/EmptyChannel/videos")==[]
  assert get_youtube_titles("https://www.youtube.com/user/OfficialChannel/videos")==["[VIDEO TITLE 1]", "[VIDEO TITLE 2]", ...]
  assert get_youtube_titles("https://www.youtube.com/user/InactiveChannel/videos")==[]
output: import requests
  import re
  
  def get_youtube_titles(url):
      response = requests.get(url)
      html_content = response.text
      titles = re.findall(r'<a href="/watch\?v=[^"]+">([^<]+)</a>', html_content)
      return titles