Java-如何将irc消息解析为人类可读

Question

I am creating an irc client in Java. It work fine but the message from the server is a bit "messed-up" for example :User1!webirc@1.9.com PRIVMSG #channel :test . So i wanna know how to parse the irc message to human readable? Here is a regex that i found ^(:(\\\\S+) )?(\\\\S+)( (?!:)(.+?))?( :(.+))?$ for irc message.

Answer 1

The IRC Protocol is documented here: https://tools.ietf.org/html/rfc2812

2.3.1 Message format in Augmented BNF

The protocol messages must be extracted from the contiguous stream of octets. The current solution is to designate two characters, CR and LF, as message separators. Empty messages are silently ignored, which permits use of the sequence CR-LF between messages without extra problems.

The extracted message is parsed into the components , and list of parameters ().

The Augmented BNF representation for this is:

message    =  [ ":" prefix SPACE ] command [ params ] crlf
prefix     =  servername / ( nickname [ [ "!" user ] "@" host ] )
command    =  1*letter / 3digit
params     =  *14( SPACE middle ) [ SPACE ":" trailing ]
           =/ 14( SPACE middle ) [ SPACE [ ":" ] trailing ]

nospcrlfcl =  %x01-09 / %x0B-0C / %x0E-1F / %x21-39 / %x3B-FF
                ; any octet except NUL, CR, LF, " " and ":"
middle     =  nospcrlfcl *( ":" / nospcrlfcl )
trailing   =  *( ":" / " " / nospcrlfcl )

SPACE      =  %x20        ; space character
crlf       =  %x0D %x0A   ; "carriage return" "linefeed"