input: Write a function to extract all email addresses from a given string using a regular expression. If no email addresses are found, 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 here")==[]
  assert find_emails("Contact us at support@company.com or sales@company.com")==['support@company.com', 'sales@company.com']
  assert find_emails("")==[]
output: import re
  
  def find_emails(text):
      pattern = r'\b[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Z|a-z]{2,}\b'
      return re.findall(pattern, text)