input: Write a function to extract all email addresses from a given string using regular expressions. The function should return a list of all email addresses found in the string.
  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 info@company.com")==['support@company.com', 'info@company.com']
  assert find_emails("")==[]
  assert find_emails("Multiple: alice@domain.com, bob@web.com")==['alice@domain.com', 'bob@web.com']
output: import re
  
  def find_emails(text):
      return re.findall(r'[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}', text)