regexp = /                    # We're using this regular expression to find email addresses that are not already linked
      #{RFC822::EmailAddrSpec}    # This is the RFC822 regular expression string to match valid email addresses, including foo@bar
      \b                          # This word break is ensuring that it doesn't grab the "m" from .com, for example
      (?!(<\/a>|["']?>|\.\w{2,})) # This negative look-ahead detects whether the email address is already auto-linked, and is not a .com
    /x