simple regex and test

src/log_parse.cpp

@@ -0,0 +1,21 @@
+#include "./log_parse.hpp"
+
+#include <regex>
+
+std::optional<LPLRes> log_parse_line(std::string_view line) {
+	static const std::regex mod_match{".*Factorio-Event-Logger+.*\\[([A-Z ]+)\\] (.+)$"};
+
+	std::cmatch matches;
+	if (!std::regex_match(line.cbegin(), line.cend(), matches, mod_match)) {
+		return std::nullopt;
+	}
+
+	if (matches.empty() || matches.size() != 3) {
+		return std::nullopt;
+	}
+
+	return LPLRes{
+		std::string_view{matches[1].first, static_cast<size_t>(matches[1].second - matches[1].first)},
+		std::string_view{matches[2].first, static_cast<size_t>(matches[2].second - matches[2].first)},
+	};
+}