diff --git a/tmp/lanelet2_extension/include/lanelet2_extension/io/autoware_osm_parser.hpp b/tmp/lanelet2_extension/include/lanelet2_extension/io/autoware_osm_parser.hpp
index 50d04c65..e498fda0 100644
--- a/tmp/lanelet2_extension/include/lanelet2_extension/io/autoware_osm_parser.hpp
+++ b/tmp/lanelet2_extension/include/lanelet2_extension/io/autoware_osm_parser.hpp
@@ -24,6 +24,7 @@
 #include <lanelet2_io/io_handlers/OsmHandler.h>
 
 #include <memory>
+#include <optional>
 #include <string>
 
 namespace lanelet::io_handlers
@@ -58,6 +59,12 @@ class AutowareOsmParser : public OsmParser
   static constexpr const char * name() { return "autoware_osm_handler"; }
 };
 
+std::optional<uint64_t> parseMajorVersion(const std::string & format_version);
+
+std::optional<uint64_t> parseMinorVersion(const std::string & format_version);
+
+std::optional<uint64_t> parsePatchVersion(const std::string & format_version);
+
 }  // namespace lanelet::io_handlers
 
 // NOLINTEND(readability-identifier-naming)
diff --git a/tmp/lanelet2_extension/include/lanelet2_extension/version.hpp b/tmp/lanelet2_extension/include/lanelet2_extension/version.hpp
index 4a88ea82..06dd5df1 100644
--- a/tmp/lanelet2_extension/include/lanelet2_extension/version.hpp
+++ b/tmp/lanelet2_extension/include/lanelet2_extension/version.hpp
@@ -21,11 +21,15 @@
 
 namespace lanelet::autoware
 {
+/*
+ * @brief denotes the major format_version
+ */
 enum class Version : int {
   none = 0,
   v1,
 };
 
+// current format_version
 static constexpr Version version = Version::v1;
 }  // namespace lanelet::autoware
 
diff --git a/tmp/lanelet2_extension/lib/autoware_osm_parser.cpp b/tmp/lanelet2_extension/lib/autoware_osm_parser.cpp
index 5c272004..426748e2 100644
--- a/tmp/lanelet2_extension/lib/autoware_osm_parser.cpp
+++ b/tmp/lanelet2_extension/lib/autoware_osm_parser.cpp
@@ -24,6 +24,7 @@
 #include <lanelet2_io/io_handlers/OsmHandler.h>
 
 #include <memory>
+#include <regex>
 #include <string>
 
 namespace lanelet::io_handlers
@@ -75,6 +76,63 @@ void AutowareOsmParser::parseVersions(
   }
 }
 
+std::optional<uint64_t> parseMajorVersion(const std::string & format_version)
+{
+  std::regex re(R"(^(\d+\.)?(\d+\.)?(\d+)$)");
+  // NOTE(Mamoru Sobue): matches `1`, `1.10`, `1.10.100`
+  // `1` ==> [`1`, ``, ``]
+  // `1.10` ==> [`1.`, ``, `10`]
+  // `1.10.100` ==> [`1.`, `10.`, `100`]
+  std::smatch match;
+  if (!std::regex_match(format_version, match, re)) {
+    return std::nullopt;
+  }
+  std::string major = match[1].str();
+  major.erase(std::remove(major.begin(), major.end(), '.'), major.end());
+  return std::stoi(major);
+}
+
+std::optional<uint64_t> parseMinorVersion(const std::string & format_version)
+{
+  std::regex re(R"(^(\d+\.)?(\d+\.)?(\d+)$)");
+  // NOTE(Mamoru Sobue): matches `1`, `1.10`, `1.10.100`
+  // `1` ==> [`1`, ``, ``]
+  // `1.10` ==> [`1.`, ``, `10`]
+  // `1.10.100` ==> [`1.`, `10.`, `100`]
+  std::smatch match;
+  if (!std::regex_match(format_version, match, re)) {
+    return std::nullopt;
+  }
+  std::string minor = match[2].str();
+  if (minor == "") {
+    if (match[3].str() == "") {
+      return std::nullopt;
+    }
+    minor = match[3].str();
+  }
+  minor.erase(std::remove(minor.begin(), minor.end(), '.'), minor.end());
+  return std::stoi(minor);
+}
+
+std::optional<uint64_t> parsePatchVersion(const std::string & format_version)
+{
+  std::regex re(R"(^(\d+\.)?(\d+\.)?(\d+)$)");
+  // NOTE(Mamoru Sobue): matches `1`, `1.10`, `1.10.100`
+  // `1` ==> [`1`, ``, ``]
+  // `1.10` ==> [`1.`, ``, `10`]
+  // `1.10.100` ==> [`1.`, `10.`, `100`]
+  std::smatch match;
+  if (!std::regex_match(format_version, match, re)) {
+    return std::nullopt;
+  }
+  std::string patch = match[3].str();
+  if (patch == "") {
+    return std::nullopt;
+  }
+  patch.erase(std::remove(patch.begin(), patch.end(), '.'), patch.end());
+  return std::stoi(patch);
+}
+
 }  // namespace lanelet::io_handlers
 
 // NOLINTEND(readability-identifier-naming)