input: Write a function to extract all email addresses from a given string using a regular expression. The function should return a list of all found email addresses. If the input string is empty, the function should 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("")==[]
  assert find_emails("One email: contact@example.org")==['contact@example.org']
  assert find_emails("Multiple emails: info@example.com, support@example.net")==['info@example.com', 'support@example.net']
output: import re
  
  def find_emails(text):
      return re.findall(r'[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}', text)