diff --git a/src/IO/S3Common.cpp b/src/IO/S3Common.cpp
index a6b518afcdc..e809474bc98 100644
--- a/src/IO/S3Common.cpp
+++ b/src/IO/S3Common.cpp
@@ -111,7 +111,7 @@ namespace S3
 
         if (!client_configuration.endpointOverride.empty())
         {
-            static const RE2 region_pattern(R"(s3[.\-]([a-z0-9\-]+)\.amazonaws\.)");
+            static const RE2 region_pattern(R"(^s3[.\-]([a-z0-9\-]+)\.amazonaws\.)");
             Poco::URI uri(client_configuration.endpointOverride);
             if (uri.getScheme() == "http")
                 client_configuration.scheme = Aws::Http::Scheme::HTTP;
@@ -138,6 +138,7 @@ namespace S3
         /// E.g. (https://bucket-name.s3.Region.amazonaws.com/key)
         /// https://docs.aws.amazon.com/AmazonS3/latest/dev/VirtualHosting.html#virtual-hosted-style-access
         static const RE2 virtual_hosted_style_pattern(R"((.+)\.(s3[.\-][a-z0-9\-.:]+))");
+
         /// Case when bucket name and key represented in path of S3 URL.
         /// E.g. (https://s3.Region.amazonaws.com/bucket-name/key)
         /// https://docs.aws.amazon.com/AmazonS3/latest/dev/VirtualHosting.html#path-style-access
diff --git a/src/IO/tests/gtest_s3_uri.cpp b/src/IO/tests/gtest_s3_uri.cpp
index accb81a6306..3609d8c25cd 100644
--- a/src/IO/tests/gtest_s3_uri.cpp
+++ b/src/IO/tests/gtest_s3_uri.cpp
@@ -17,7 +17,7 @@ TEST(S3UriTest, validPatterns)
 {
     {
         S3::URI uri(Poco::URI("https://jokserfn.s3.yandexcloud.net/data"));
-        ASSERT_EQ("https://jokserfn.s3.yandexcloud.net", uri.endpoint);
+        ASSERT_EQ("https://s3.yandexcloud.net", uri.endpoint);
         ASSERT_EQ("jokserfn", uri.bucket);
         ASSERT_EQ("data", uri.key);
     }