rfc2047-encoded-word-regexp-loose

rfc2047-encoded-word-regexp-loose is a variable defined in `rfc2047.el'.
Its value is

"=\\?\\([^][- ()<>@,;:*\\\"/?.=]+\\)\\(?:\\*[^?]+\\)?\\?\\(B\\?[+/0-9A-Za-z]*=*\\|Q\\?\\(?:\\?+[ -<>@-~]\\)?\\(?:[ ->@-~]+\\?+[ -<>@-~]\\)*[ ->@-~]*\\?*\\)\\?="

• This variable may be risky if used as a file-local variable.

Documentation:
Regexp that matches encoded word allowing loose Q encoding.