c++ - c++11 - regex matching -


i extracting info string using regex. 

  auto version = { // comments shows expected output     // version         // output : (year, month, sp#, patch#)     "2012.12",         // "2012", "12", "", ""     "2012.12-1",       // "2012", "12", "", "1"      "2012.12-sp1",     // "2012", "12", "sp1", ""      "2012.12-sp2-1",   // "2012", "12", "sp2", "1"      "i-2013.12-2",     // "2013", "12", "", "2"     "j-2014.09",       // "2014", "09", "", ""     "j-2014.09-sp2-1", // "2014", "09", "sp2", "1" };

the regex have following:

    //                  j   -  2014       .  09      -  sp2      -  1   std::regex regexexpr("[a-z]?-?([0-9]{4})\\.([0-9]{2})-?(sp[1-9])?-?([1-9])?.*");

and seems work well. not confident since don't have expertise in regex. regex right , can improved?

you can use \w{2,}|\d regex match combinations of word characters length 2 or more (\w{2,})(to avoid of matching j @ beginning of strings) or digit length 1 (\d)(for match 1 @ end of strings)!

demo

you can use sub_match class template aim:

the class template sub_match used regular expression engine denote sequences of characters matched marked sub-expressions. match [begin, end) pair within target range matched regular expression, additional observer functions enhance code clarity.


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