Extract All Hashtags from Text using Regex in JavaScript

function extractHashtags(text) {
  const hashtagRegex = /#(\w+)/g;
  const matches = text.match(hashtagRegex);
  return matches ? matches.map(match => match.substring(1)) : [];
}

// Examples:
// const text1 = "This is a #test post with multiple #hashtags.";
// console.log(extractHashtags(text1)); // ["test", "hashtags"]

// const text2 = "No hashtags here.";
// console.log(extractHashtags(text2)); // []

How it works: This JavaScript function uses a regular expression with the global flag (`g`) to find all occurrences of hashtags in a given string. The pattern `/#(\w+)/` captures words immediately following a '#' symbol. The `match()` method returns an array of matched strings, from which the leading '#' is removed before returning the cleaned list of hashtags. This is commonly used in social media features.