c++ - irc channel regex composition -

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i'm having trouble composing regex string irc channel

// digit      =  %x30-39                 ; 0-9 static const std::string digit("(?:[\x30-\x39])"); // channelid  = 5( %x41-5a / digit )   ; 5( a-z / 0-9 ) static const std::string channelid("(?:(?:[\x41-\x5a]|" + digit + "){5})"); // chanstring =  %x01-07 / %x08-09 / %x0b-0c / %x0e-1f / %x21-2b / %x2d - 39 / %x3b - ff static const std::string chanstring("(?:[\x01-\x07\x08-\x09\x0b-\x0c\x0e-\x1f\x21-\x2b\x2d-\x39\x3b-\xff])"); // channel    =  ( "#" / "+" / ( "!" channelid ) / "&" ) chanstring [":" chanstring] static const std::string channel("(?:(?:[#+&]|(?:!" + channelid + "))" + chanstring + "(?::" + chanstring + ")?)");

i'm digit , channelid formed.

const std::regex digit(dapps::regex::digit); assert(std::regex_match("0", digit)); assert(std::regex_match("1", digit)); assert(std::regex_match("2", digit)); assert(std::regex_match("3", digit)); assert(std::regex_match("4", digit)); assert(std::regex_match("5", digit)); assert(std::regex_match("6", digit)); assert(std::regex_match("7", digit)); assert(std::regex_match("8", digit)); assert(std::regex_match("9", digit)); assert(!std::regex_match("10", digit));  const std::regex channelid(dapps::regex::channelid); assert(std::regex_match("abcde", channelid)); assert(std::regex_match("12345", channelid));

and i'm pretty sure chanstring formed well, why doesn't work?

const std::regex channel(dapps::regex:: channel); assert(std::regex_match("#channelname", channel));

the problem chanstring matches strings of length 1. it's regex [^\x00\x07\x0d\x0a ,:], needs {n}, *, or + @ end match more 1 character.

unfortunately, doesn't seem issue in code. rfc 2812's abnf defines grammar (trimming unused syntaxes):

channel    =  ( "#" / "+" / ( "!" channelid ) / "&" ) chanstring               [ ":" chanstring ] chanstring =  %x01-07 / %x08-09 / %x0b-0c / %x0e-1f / %x21-2b chanstring =/ %x2d-39 / %x3b-ff                 ; octet except nul, bell, cr, lf, " ", "," , ":" channelid  = 5( %x41-5a / digit )   ; 5( a-z / 0-9 )

that grammar definition makes chanstring match strings of length 1. should have defined chanstring 1*44(...), or similar.

to work around issue, you'll either have create beastly, unwieldy regex (for example, like this) or manually check channel's length make sure doesn't exceed valid limits (50, say) before validating regex.


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