How to Extract YouTube Video IDs from Strings Using Regular Expressions?

Extract YouTube Video IDs from Strings Using Regex

Problem:

You have a text field where users can input arbitrary text, and you need to extract all YouTube video URLs and their corresponding IDs.

Solution:

To extract YouTube video IDs from strings using a regular expression, follow these steps:

1. Define the Regex Pattern:

   https?:\/\/(?:[0-9A-Z-]+\.)?(?:youtu\.be\/|youtube(?:-nocookie)?\.com\S*?[^\w\s-])([\w-]{11})(?=[^\w-]|$)(?![?=&amp;+%\w.-]*(?:['"][^<>]*>|</a>))[?=&amp;+%\w.-]*

   Explanation:

   • Matches the video URL pattern with various formats
   • Captures the YouTube ID in $1

2. Use the Regex to Parse the Text:

   Use the re.findall function to search for all YouTube video URLs in the text.

   import re
   
   def find_video_ids(text):
       pattern = r'https?:\/\/(?:[0-9A-Z-]+\.)?(?:youtu\.be\/|youtube(?:-nocookie)?\.com\S*?[^\w\s-])([\w-]{11})(?=[^\w-]|$)(?![?=&amp;+%\w.-]*(?:['"][^<>]*>|</a>))[?=&amp;+%\w.-]*'
       return re.findall(pattern, text)

3. Extract the Video IDs:

   The re.findall function returns a list of matched video URLs. You can access the video IDs from each URL using [:11] (YouTube video IDs are 11 characters long).

   def get_video_ids(text):
       video_urls = find_video_ids(text)
       return [url[:11] for url in video_urls]

Example:

text = """
Lorem Ipsum is simply dummy text.
https://www.youtube.com/watch?v=DUQi_R4SgWo
of the printing and typesetting
industry. Lorem Ipsum has been the
industry's standard dummy text ever
since the 1500s, when an unknown
printer took a galley of type and
scrambled it to make a type specimen
book. It has survived not only five
centuries, but also the leap into
electronic typesetting, remaining
essentially unchanged.
https://www.youtube.com/watch?v=A_6gNZCkajU&feature=relmfu
It was popularised in the 1960s with
the release of Letraset sheets
containing Lorem Ipsum passages, and
more recently with desktop publishing
software like Aldus PageMaker
including versions of Lorem Ipsum."""

video_ids = get_video_ids(text)
print(video_ids)
# Output: ['DUQi_R4SgWo', 'A_6gNZCkajU']

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