Language
C++
Compiler
clang 6.0.1
Options
Warnings
Boost 1.67.0
C++2a(GNU)
no pedantic
$ clang++ prog.cc -Wall -Wextra -I/opt/wandbox/boost-1.67.0/clang-6.0.1/include -std=gnu++2a terminating with uncaught exception of type std::__1::regex_error: One of *?+{ was not preceded by a valid regular expression.
Signal:
Aborted