regex checked by hyperscan directly with error messages

backend/binsrc/nfregex.cpp

@@ -50,6 +50,21 @@ void config_updater (){
 }
 
 int main(int argc, char *argv[]){
+
+	char * test_regex = getenv("FIREGEX_TEST_REGEX");
+	if (test_regex != nullptr){
+		cerr << "[info] [main] Testing regex: " << test_regex << endl;
+		try{
+			RegexRules::compile_regex(test_regex);
+			cerr << "[info] [main] Test passed" << endl;
+			return 0;
+		}catch(const std::exception& e){
+			cerr << "[error] [updater] Test failed" << endl;
+			cout << e.what() << flush;
+			return 1;
+		}
+	}
+
 	int n_of_threads = 1;
    	char * n_threads_str = getenv("NTHREADS");
    	if (n_threads_str != nullptr) n_of_threads = ::atoi(n_threads_str);

backend/binsrc/regex/regex_rules.cpp

@@ -59,6 +59,26 @@ class RegexRules{
 	public:
 		regex_ruleset output_ruleset, input_ruleset;
 		
+	static void compile_regex(char* regex){
+		hs_database_t* db = nullptr;
+		hs_compile_error_t *compile_err = nullptr;
+		if (
+			hs_compile(
+				regex,
+				HS_FLAG_SINGLEMATCH | HS_FLAG_ALLOWEMPTY,
+				HS_MODE_BLOCK,
+				nullptr, &db, &compile_err
+			) != HS_SUCCESS
+		) {
+			string err = string(compile_err->message);
+			hs_free_compile_error(compile_err);
+			throw runtime_error(err);
+		}else{
+			hs_free_database(db);
+		}
+		
+	}
+
 	private:
 		static inline u_int16_t glob_seq = 0;
 		u_int16_t version;
@@ -77,6 +97,8 @@ class RegexRules{
 			}
 		}
 
+
+
 		void fill_ruleset(vector<pair<string, decoded_regex>> & decoded, regex_ruleset & ruleset){
 			size_t n_of_regex = decoded.size();
 			if (n_of_regex == 0){