input: Write a function to extract all email addresses from a given string using regular expressions. If there are no email addresses, return an empty list.
  assert find_emails("This is an example with two emails: john@example.com, and jane@example.com") == ['john@example.com', 'jane@example.com']
  assert find_emails("No emails in this string!") == []
  assert find_emails("info@company.com and support@company.com are official emails.") == ['info@company.com', 'support@company.com']
  assert find_emails("") == []
output: import re
  
  def find_emails(text):
      return re.findall(r'[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}', text)