c++11 - C++ boost::regex_match strange behaviour -


trying boost::regex_match , got strange behaviour.

boost::cmatch what; std::string fn_re_str = r"(\.sig\|\|([a-za-z0-9$]+)\()"; boost::regex fn_re(fn_re_str); if (boost::regex_match("{var d=a[c];if(d.sig||d.s){var e=d.sig||qt(d.", what, fn_re)) {     std::cout << what[1] << std::endl; } else {     std::cerr << "not found" << std::endl; }

qt expected found.

here https://regex101.com/r/ir9rw5/1 found.

why boost::regex_match can't find it? miss something?

regex_match matches full input: documentation

⚠ important

note result true if expression matches whole of input sequence. if want search expression somewhere within sequence use regex_search. if want match prefix of character string use regex_search flag match_continuous set

use regex_search

live on coliru

#include <boost/regex.hpp> #include <iostream>  int main() {     boost::cmatch what;     std::string fn_re_str = r"(\.sig\|\|([a-za-z0-9$]+)\()";     boost::regex fn_re(fn_re_str);     if (boost::regex_search("{var d=a[c];if(d.sig||d.s){var e=d.sig||qt(d.", what, fn_re)) {         std::cout << what[1] << std::endl;     } else {         std::cerr << "not found" << std::endl;     } }

prints

qt

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