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

How to Extract YouTube Video IDs from Text Using Regular Expressions

Problem:

Given a text field where users can enter text, the task is to extract all YouTube video URLs and their corresponding IDs.

Solution using Regular Expressions:

To extract YouTube video IDs from a given string, you can use a regular expression that can match all possible YouTube URL formats. Here's a sample regex that can achieve this:

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

Regex Breakdown:

• https?://: Matches either HTTP or HTTPS protocol.
• (?:[0-9A-Z-] .)?: Matches an optional subdomain.
• (?:youtu.be/|youtube(?:-nocookie)?.comS*?[^ws-]): Matches any of the YouTube host formats, including "youtu.be", "youtube.com", "youtube-nocookie.com", and allows for additional characters before the video ID.
• ([w-]{11}) (Capture Group): Captures the YouTube video ID, which is an 11-character alphanumeric string.
• (?=[^w-]|$): Positive lookahead assertion that matches if the next character is not an alphanumeric character or the end of the string.
• (?![?=& %w.-]*(?:['"][^<>]*>|))[?=& %w.-]*: Negative lookahead assertion that ensures the URL is not already linked.

Usage:

You can use this regex with any programming language that supports regular expressions. For example, in JavaScript, you can use the following code to extract YouTube video IDs:

function extractYouTubeIds(text) {
  const regex = /https?://(?:[0-9A-Z-]+\.)?(?:youtu.be/|youtube(?:-nocookie)?.com\S*?[^\w\s-])([\w-]{11})(?=[^\w-]|$)(?![?=&amp;+%\w.-]*(?:['"][^<>]*>|</a>))[?=&amp;+%\w.-]*/;
  const matches = text.match(regex);
  return matches ? matches.map(id => id.slice(17)) : [];
}

Note that the slice(17) removes the "https://www.youtube.com/watch?v=" prefix from the YouTube URL to extract the video ID.

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