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.

Makefile

@@ -1,8 +1,8 @@
 
 
-CXXFLAGS=-std=c++17 -O0 -g -pg -no-pie -pipe -MMD -Wall -Wextra
+CXXFLAGS=-std=c++17 -O0 -g -no-pie -pipe -MMD -Wall -Wextra
 RELEASE_CXXFLAGS=-std=c++17 -O3 -pipe -MMD -Wall -Wextra
-LDFLAGS=-lsqlite3 -lpthread -lcrypto -lstdc++fs
+LDFLAGS=-lsqlite3 -lpthread -lcrypto -lboost_regex -lstdc++fs
 
 #currently default g++ versions in most distros do not usually support c++17 well enough
 CXX=g++-8.2.0