terminate called after throwing an instance of 'std::regex_error'

一夜之间所有代码都跑不了了，这是发生了什么吗

#include <string>
#include <regex>

int main() {
    std::regex re=std::regex ("keyword");
    std::string str=std::string("keyword-test");
    std::regex_search(str,re);
    return 0;
}

terminate called after throwing an instance of 'std::regex_error' what(): Unexpected character in brace expression.

Process finished with exit code 134 (interrupted by signal 6: SIGABRT)