Temporarily switch to boost::regex

In combination with musl, parser crashed. glibc fine. Could not pinpoint
down the exact reason mainly due to time constraints. Strange, in both
cases actually libstdc++ is used, so this is very odd.

utils.h

@@ -8,6 +8,7 @@
 #include <map>
 #include <regex>
 #include <ctime>
+#include <boost/regex.hpp>
 namespace utils
 {
 
@@ -57,8 +58,8 @@ template <class T, class U> std::vector<U> getAll(std::multimap<T, U> map, T key
 	return result;
 }
 
-std::string regex_callback_replacer(std::regex regex, const std::string &input,
-									std::function<std::string(std::smatch &)> callback);
+std::string regex_callback_replacer(boost::regex regex, const std::string &input,
+									std::function<std::string(boost::smatch &)> callback);
 
 std::string readCompleteFile(std::string_view filepath);