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.cpp

@@ -24,8 +24,10 @@ SOFTWARE.
 #include <map>
 #include <cstdlib>
 #include <fstream>
+#include <boost/regex.hpp>
 #include "logger.h"
 #include "utils.h"
+
 // TODO: instead of returning vector maybe provide an iterator version too.
 
 // TODO: % may not be necessary (was in C version just to be sure against format string attacks
@@ -133,16 +135,16 @@ std::string utils::readCompleteFile(std::string_view filepath)
 	return content;
 }
 
-std::string utils::regex_callback_replacer(std::regex regex, const std::string &input,
-										   std::function<std::string(std::smatch &)> callback)
+std::string utils::regex_callback_replacer(boost::regex regex, const std::string &input,
+										   std::function<std::string(boost::smatch &)> callback)
 {
 	std::string result;
-	auto tagsbegin = std::sregex_iterator(input.begin(), input.end(), regex);
-	auto tagsend = std::sregex_iterator();
+	auto tagsbegin = boost::sregex_iterator(input.begin(), input.end(), regex);
+	auto tagsend = boost::sregex_iterator();
 	auto matchbegin = 0;
-	for(std::sregex_iterator i = tagsbegin; i != tagsend; ++i)
+	for(boost::sregex_iterator i = tagsbegin; i != tagsend; ++i)
 	{
-		std::smatch match = *i;
+		boost::smatch match = *i;
 
 		auto matchlength = match.length(0);
 		auto matchpos = match.position();