fs::path upper("c:/differences", fs::native); fs::path checked(upper/"checked"); assert(fs::exists(upper)); assert(fs::exists(checked)); fs::directory_iterator end; rg::regex rgx("*ps", rg::regex::basic); for (fs::directory_iterator it(upper); it != end; ++it) { if (rg::regex_match(it->string(), rgx)) std::cout << "MATCH: "; else std::cout << "NOMATCH: "; std::cout << it->string() << std::endl; } Supposed to be looking for ps files. tried *\\.ps, which should work but also didn't. Doesn't match any of the strings. One example line of output: NOMATCH: c:/differences/Adj. speed test case 5 (metric units).ps Supposedly regex is greedy, no? It should accept . as a * element and continue to match everything up to ps and ps also...why no worky? Thanks.