Re: [Boost-users] Pattern matching with boost

I'm trying to parse a relatively simple pattern across 4 std::strings, extracting whatever the part which matches the pattern into a separate std::string.

In an abstracted sense, here is what I want: s1=<string1><consecutive number>, s2=<consecutive number><string2>, s3=<string1><consecutive number>, s4=<consecutive number><string2>

Less abstracted: s1="apple 1", s2="2 cheese", s3="apple 3", s4="4 cheese"

Actual contents: s1="lxckvjlxcjvlkjlkje xvcjxzlvcj wqrej lxvcjz ljvl;x czvouzxvcu j;ljfds apple 1 xcvljxclvjx oueroi xcvzlkjv; zjx", s2="xzljlkxvc jlkjxzvl jxcvljzx lvjlkj wre 2 cheese", s3="apple 3", s4="kxclvj xcvjlxk jcvljxlck jxcvl 4 cheese"

How would I perform this pattern matching?

Use Spirit. I'm not sure I understand your grammar well, but try the following trivial sample: #include namespace qi = boost::spirit::qi; using qi::char_; using qi::parse; int main() { std::string input = "abcd apple 1 qwerty", output; bool res = parse(input.begin(), input.end(), qi::omit[*(char_ - (+char_("a-zA-Z") >> ' ' >> +char_("0-9")))] >> +char_("a-zA-Z") >> qi::string(" ") >> +char_("0-9"), output); }