Given a string, if the string is a quoted string (without CFWS around it, although it will be trimmed) then remove the bounding quotations and then
unescape it.
See getInternetAddress; does the same thing but returns the constituent parts of the address in a three-element array (or null if the address is
invalid).
Given a string, extract the first matched comment token as defined in 2822, trimmed; return null on all errors or non-findings
This is probably not super-useful.
See getInternetAddress; does the same thing but returns the local part that would have been returned from getInternetAddress() in String form
(essentially, the part to the left of the @).
Using the given validation criteria, checks to see if the specified string is a valid email address according to the RFC 2822 specification, which is
remarkably squirrely.