$rfc822:qtext-char
[\u0000-\u000C\u000E-!\u0023-\u005B\u005D-\u007F]
[\x00-\x0C\x0E-!\x23-\x5B\x5D-\x7F]
Test a string: Show
Compare with: Show
Complemetary
[Notes] [RFC822]
The set definition is contained in sets.json data file.
sets.json