This question seems fairly pedantic, however it feels reasonably important when trying to follow the RFC. I am trying to write an IRC client and I am using the RFC to follow how the protocol should be written. I came across the section for message prefixes and was slightly confused by what was written.
Each IRC message may consist of up to three main parts: the prefix (optional), the command, and the command parameters (of which there may be up to 15). The prefix, command, and all parameters are separated by one (or more) ASCII space character(s) (0x20).
The presence of a prefix is indicated with a single leading ASCII colon character (':', 0x3b), which must be the first character of the message itself. There must be no gap (whitespace) between the colon and the prefix.
My question concerns the first sentence in the second paragraph; ASCII colon character (':', 0x3b). With (to my understanding) 0x3bbeing the ASCII character for a semi-colon, does this mean that the prefix may be either semi-colon or a colon, or is it simply a typo in the document? I'm going ahead with using a colon for now, however my curiosity is nagging away at me.
The colon : (0x3a) is correct.
This is the first errata listed for RFC1459.