diff --git a/ydb/core/external_sources/object_storage.cpp b/ydb/core/external_sources/object_storage.cpp
index fc42c5479f58..1dc86b169190 100644
--- a/ydb/core/external_sources/object_storage.cpp
+++ b/ydb/core/external_sources/object_storage.cpp
@@ -67,7 +67,7 @@ struct TObjectStorageExternalSource : public IExternalSource {
             }
         }
 
-        if (auto issues = Validate(schema, objectStorage, PathsLimit)) {
+        if (auto issues = Validate(schema, objectStorage, PathsLimit, general.location())) {
             ythrow TExternalSourceException() << issues.ToString();
         }
 
@@ -136,11 +136,18 @@ struct TObjectStorageExternalSource : public IExternalSource {
     }
 
     template<typename TScheme, typename TObjectStorage>
-    static NYql::TIssues Validate(const TScheme& schema, const TObjectStorage& objectStorage, size_t pathsLimit) {
+    static NYql::TIssues Validate(const TScheme& schema, const TObjectStorage& objectStorage, size_t pathsLimit, const TString& location) {
         NYql::TIssues issues;
-        issues.AddIssues(ValidateFormatSetting(objectStorage.format(), objectStorage.format_setting()));
+        if (TString errorString = NYql::NS3::ValidateWildcards(location)) {
+            issues.AddIssue(MakeErrorIssue(Ydb::StatusIds::BAD_REQUEST, TStringBuilder() << "Location '" << location << "' contains invalid wildcard: " << errorString));
+        }
+        const bool hasPartitioning = objectStorage.projection_size() || objectStorage.partitioned_by_size();
+        issues.AddIssues(ValidateFormatSetting(objectStorage.format(), objectStorage.format_setting(), location, hasPartitioning));
         issues.AddIssues(ValidateRawFormat(objectStorage.format(), schema, objectStorage.partitioned_by()));
-        if (objectStorage.projection_size() || objectStorage.partitioned_by_size()) {
+        if (hasPartitioning) {
+            if (NYql::NS3::HasWildcards(location)) {
+                issues.AddIssue(MakeErrorIssue(Ydb::StatusIds::BAD_REQUEST, TStringBuilder() << "Location '" << location << "' contains wildcards"));
+            }
             try {
                 TVector<TString> partitionedBy{objectStorage.partitioned_by().begin(), objectStorage.partitioned_by().end()};
                 issues.AddIssues(ValidateProjectionColumns(schema, partitionedBy));
@@ -160,11 +167,17 @@ struct TObjectStorageExternalSource : public IExternalSource {
         return issues;
     }
 
-    static NYql::TIssues ValidateFormatSetting(const TString& format, const google::protobuf::Map<TString, TString>& formatSetting) {
+    static NYql::TIssues ValidateFormatSetting(const TString& format, const google::protobuf::Map<TString, TString>& formatSetting, const TString& location, bool hasPartitioning) {
         NYql::TIssues issues;
         issues.AddIssues(ValidateDateFormatSetting(formatSetting));
         for (const auto& [key, value]: formatSetting) {
             if (key == "file_pattern"sv) {
+                if (TString errorString = NYql::NS3::ValidateWildcards(value)) {
+                    issues.AddIssue(MakeErrorIssue(Ydb::StatusIds::BAD_REQUEST, TStringBuilder() << "File pattern '" << value << "' contains invalid wildcard: " << errorString));
+                }
+                if (value && !hasPartitioning && !location.EndsWith("/")) {
+                    issues.AddIssue(MakeErrorIssue(Ydb::StatusIds::BAD_REQUEST, "Path pattern cannot be used with file_pattern"));
+                }
                 continue;
             }
 
@@ -631,8 +644,8 @@ IExternalSource::TPtr CreateObjectStorageExternalSource(const std::vector<TRegEx
     return MakeIntrusive<TObjectStorageExternalSource>(hostnamePatterns, actorSystem, pathsLimit, std::move(credentialsFactory), enableInfer, allowLocalFiles);
 }
 
-NYql::TIssues Validate(const FederatedQuery::Schema& schema, const FederatedQuery::ObjectStorageBinding::Subset& objectStorage, size_t pathsLimit) {
-    return TObjectStorageExternalSource::Validate(schema, objectStorage, pathsLimit);
+NYql::TIssues Validate(const FederatedQuery::Schema& schema, const FederatedQuery::ObjectStorageBinding::Subset& objectStorage, size_t pathsLimit, const TString& location) {
+    return TObjectStorageExternalSource::Validate(schema, objectStorage, pathsLimit, location);
 }
 
 NYql::TIssues ValidateDateFormatSetting(const google::protobuf::Map<TString, TString>& formatSetting, bool matchAllSettings) {
diff --git a/ydb/core/external_sources/object_storage.h b/ydb/core/external_sources/object_storage.h
index d156b503734c..74de7a69eb87 100644
--- a/ydb/core/external_sources/object_storage.h
+++ b/ydb/core/external_sources/object_storage.h
@@ -16,7 +16,7 @@ IExternalSource::TPtr CreateObjectStorageExternalSource(const std::vector<TRegEx
                                                         bool enableInfer,
                                                         bool allowLocalFiles);
 
-NYql::TIssues Validate(const FederatedQuery::Schema& schema, const FederatedQuery::ObjectStorageBinding::Subset& objectStorage, size_t pathsLimit);
+NYql::TIssues Validate(const FederatedQuery::Schema& schema, const FederatedQuery::ObjectStorageBinding::Subset& objectStorage, size_t pathsLimit, const TString& location);
 
 NYql::TIssues ValidateDateFormatSetting(const google::protobuf::Map<TString, TString>& formatSetting, bool matchAllSettings = false);
 
diff --git a/ydb/core/external_sources/object_storage_ut.cpp b/ydb/core/external_sources/object_storage_ut.cpp
index 26134476eff9..23fcc0e214a6 100644
--- a/ydb/core/external_sources/object_storage_ut.cpp
+++ b/ydb/core/external_sources/object_storage_ut.cpp
@@ -29,6 +29,32 @@ Y_UNIT_TEST_SUITE(ObjectStorageTest) {
         general.mutable_attributes()->insert({"projection.h", "b"});
         UNIT_ASSERT_EXCEPTION_CONTAINS(source->Pack(schema, general), NExternalSource::TExternalSourceException, "Partition by must always be specified");
     }
+
+    Y_UNIT_TEST(WildcardsValidation) {
+        auto source = NExternalSource::CreateObjectStorageExternalSource({}, nullptr, 1000, nullptr, false, false);
+        NKikimrExternalSources::TSchema schema;
+
+        {  // location
+            NKikimrExternalSources::TGeneral general;
+            general.set_location("{");
+            UNIT_ASSERT_EXCEPTION_CONTAINS(source->Pack(schema, general), NExternalSource::TExternalSourceException, "Location '{' contains invalid wildcard:");
+        }
+
+        {  // file pattern
+            NKikimrExternalSources::TGeneral general;
+            general.mutable_attributes()->insert({"file_pattern", "{"});
+            UNIT_ASSERT_EXCEPTION_CONTAINS(source->Pack(schema, general), NExternalSource::TExternalSourceException, "File pattern '{' contains invalid wildcard:");
+            general.set_location("/test_file");
+            UNIT_ASSERT_EXCEPTION_CONTAINS(source->Pack(schema, general), NExternalSource::TExternalSourceException, "Path pattern cannot be used with file_pattern");
+        }
+
+        {  // partitioned by
+            NKikimrExternalSources::TGeneral general;
+            general.set_location("*");
+            general.mutable_attributes()->insert({"partitioned_by", "[year]"});
+            UNIT_ASSERT_EXCEPTION_CONTAINS(source->Pack(schema, general), NExternalSource::TExternalSourceException, "Location '*' contains wildcards");
+        }
+    }
 }
 
 } // NKikimr
diff --git a/ydb/core/fq/libs/control_plane_storage/request_validators.h b/ydb/core/fq/libs/control_plane_storage/request_validators.h
index c17ac4d41a16..557a2c81a400 100644
--- a/ydb/core/fq/libs/control_plane_storage/request_validators.h
+++ b/ydb/core/fq/libs/control_plane_storage/request_validators.h
@@ -121,7 +121,7 @@ NYql::TIssues ValidateBinding(const T& ev, size_t maxSize, const TSet<FederatedQ
         case FederatedQuery::BindingSetting::kObjectStorage:
             const FederatedQuery::ObjectStorageBinding objectStorage = setting.object_storage();
             for (const auto& subset: objectStorage.subset()) {
-                issues.AddIssues(NKikimr::NExternalSource::Validate(subset.schema(), subset, pathsLimit));
+                issues.AddIssues(NKikimr::NExternalSource::Validate(subset.schema(), subset, pathsLimit, subset.path_pattern()));
             }
             break;
         }
diff --git a/ydb/core/kqp/gateway/utils/scheme_helpers.cpp b/ydb/core/kqp/gateway/utils/scheme_helpers.cpp
index eae21c0b0d43..fd558af336e4 100644
--- a/ydb/core/kqp/gateway/utils/scheme_helpers.cpp
+++ b/ydb/core/kqp/gateway/utils/scheme_helpers.cpp
@@ -88,6 +88,7 @@ void FillCreateExternalTableColumnDesc(NKikimrSchemeOp::TExternalTableDescriptio
         columnDesc.SetNotNull(columnIt->second.NotNull);
     }
     NKikimrExternalSources::TGeneral general;
+    general.set_location(settings.Location);
     auto& attributes = *general.mutable_attributes();
     for (const auto& [key, value]: settings.SourceTypeParameters) {
         attributes.insert({key, value});
diff --git a/ydb/core/kqp/ut/federated_query/s3/kqp_federated_query_ut.cpp b/ydb/core/kqp/ut/federated_query/s3/kqp_federated_query_ut.cpp
index 74431d56d879..cc5ec37a0215 100644
--- a/ydb/core/kqp/ut/federated_query/s3/kqp_federated_query_ut.cpp
+++ b/ydb/core/kqp/ut/federated_query/s3/kqp_federated_query_ut.cpp
@@ -35,7 +35,7 @@ Y_UNIT_TEST_SUITE(KqpFederatedQuery) {
         const TString externalDataSourceName = "/Root/external_data_source";
         const TString externalTableName = "/Root/test_binding_resolve";
         const TString bucket = "test_bucket1";
-        const TString object = TStringBuilder() << "test_" << GetSymbolsString(' ', '~', "{}") << "_object";
+        const TString object = TStringBuilder() << "test_" << GetSymbolsString(' ', '~', "*?{}") << "_object";
 
         CreateBucketWithObject(bucket, object, TEST_CONTENT);
 
@@ -2143,7 +2143,7 @@ Y_UNIT_TEST_SUITE(KqpFederatedQuery) {
 
     Y_UNIT_TEST(TestReadEmptyFileWithCsvFormat) {
         const TString externalDataSourceName = "/Root/external_data_source";
-        const TString bucket = "test_bucket1";
+        const TString bucket = "test_bucket12";
 
         CreateBucketWithObject(bucket, "test_object", "");
 
@@ -2181,6 +2181,60 @@ Y_UNIT_TEST_SUITE(KqpFederatedQuery) {
         NYdb::NQuery::TScriptExecutionOperation readyOp = WaitScriptExecutionOperation(scriptExecutionOperation.Id(), kikimr->GetDriver());
         UNIT_ASSERT_EQUAL_C(readyOp.Metadata().ExecStatus, EExecStatus::Completed, readyOp.Status().GetIssues().ToString());
     }
+
+    Y_UNIT_TEST(TestWildcardValidation) {
+        const TString bucket = "test_bucket13";
+
+        CreateBucket(bucket);
+
+        auto kikimr = NTestUtils::MakeKikimrRunner();
+
+        auto tc = kikimr->GetTableClient();
+        auto session = tc.CreateSession().GetValueSync().GetSession();
+        const TString query = fmt::format(R"(
+            CREATE EXTERNAL DATA SOURCE `/Root/external_data_source` WITH (
+                SOURCE_TYPE="ObjectStorage",
+                LOCATION="{location}",
+                AUTH_METHOD="NONE"
+            );)",
+            "location"_a = GetBucketLocation(bucket)
+        );
+        auto result = session.ExecuteSchemeQuery(query).GetValueSync();
+        UNIT_ASSERT_C(result.GetStatus() == NYdb::EStatus::SUCCESS, result.GetIssues().ToString());
+
+        auto db = kikimr->GetQueryClient();
+
+        {  // path validation
+            const TString sql = R"(
+                    SELECT * FROM `/Root/external_data_source`.`/{` WITH (
+                        SCHEMA = (data String),
+                        FORMAT = "csv_with_names"
+                    ))";
+
+            auto scriptExecutionOperation = db.ExecuteScript(sql).ExtractValueSync();
+            UNIT_ASSERT_VALUES_EQUAL_C(scriptExecutionOperation.Status().GetStatus(), EStatus::SUCCESS, scriptExecutionOperation.Status().GetIssues().ToString());
+
+            NYdb::NQuery::TScriptExecutionOperation readyOp = WaitScriptExecutionOperation(scriptExecutionOperation.Id(), kikimr->GetDriver());
+            UNIT_ASSERT_EQUAL_C(readyOp.Metadata().ExecStatus, EExecStatus::Failed, readyOp.Status().GetIssues().ToString());
+            UNIT_ASSERT_STRING_CONTAINS(readyOp.Status().GetIssues().ToString(), "Path '/{' contains invalid wildcard:");
+        }
+
+        {  // file pattern validation
+            const TString sql = R"(
+                    SELECT * FROM `/Root/external_data_source`.`/` WITH (
+                        SCHEMA = (data String),
+                        FORMAT = "csv_with_names",
+                        FILE_PATTERN = "{"
+                    ))";
+
+            auto scriptExecutionOperation = db.ExecuteScript(sql).ExtractValueSync();
+            UNIT_ASSERT_VALUES_EQUAL_C(scriptExecutionOperation.Status().GetStatus(), EStatus::SUCCESS, scriptExecutionOperation.Status().GetIssues().ToString());
+
+            NYdb::NQuery::TScriptExecutionOperation readyOp = WaitScriptExecutionOperation(scriptExecutionOperation.Id(), kikimr->GetDriver());
+            UNIT_ASSERT_EQUAL_C(readyOp.Metadata().ExecStatus, EExecStatus::Failed, readyOp.Status().GetIssues().ToString());
+            UNIT_ASSERT_STRING_CONTAINS(readyOp.Status().GetIssues().ToString(), "File pattern '{' contains invalid wildcard:");
+        }
+    }
 }
 
 } // namespace NKikimr::NKqp
diff --git a/ydb/core/kqp/ut/federated_query/s3/kqp_federated_scheme_ut.cpp b/ydb/core/kqp/ut/federated_query/s3/kqp_federated_scheme_ut.cpp
index 39e53fd71eef..57f1694e1ea4 100644
--- a/ydb/core/kqp/ut/federated_query/s3/kqp_federated_scheme_ut.cpp
+++ b/ydb/core/kqp/ut/federated_query/s3/kqp_federated_scheme_ut.cpp
@@ -215,6 +215,28 @@ Y_UNIT_TEST_SUITE(KqpFederatedSchemeTest) {
         };
         TestInvalidDropForExternalTableWithAuth(queryClientExecutor, "generic_query");
     }
+
+    Y_UNIT_TEST(ExternalTableDdlLocationValidation) {
+        auto kikimr = NTestUtils::MakeKikimrRunner();
+        auto db = kikimr->GetTableClient();
+        auto session = db.CreateSession().GetValueSync().GetSession();
+        auto query = TStringBuilder() << R"(
+            CREATE EXTERNAL DATA SOURCE `/Root/ExternalDataSource` WITH (
+                SOURCE_TYPE="ObjectStorage",
+                LOCATION="my-bucket",
+                AUTH_METHOD="NONE"
+            );
+            CREATE EXTERNAL TABLE `/Root/ExternalTable` (
+                Key Uint64,
+                Value String
+            ) WITH (
+                DATA_SOURCE="/Root/ExternalDataSource",
+                LOCATION="{"
+            );)";
+        auto result = session.ExecuteSchemeQuery(query).GetValueSync();
+        UNIT_ASSERT_VALUES_EQUAL(result.GetStatus(), EStatus::SCHEME_ERROR);
+        UNIT_ASSERT_STRING_CONTAINS(result.GetIssues().ToString(), "Location '{' contains invalid wildcard:");
+    }
 }
 
 } // namespace NKikimr::NKqp
diff --git a/ydb/core/kqp/ut/scheme/kqp_scheme_ut.cpp b/ydb/core/kqp/ut/scheme/kqp_scheme_ut.cpp
index 86377719e4bd..1241dd465275 100644
--- a/ydb/core/kqp/ut/scheme/kqp_scheme_ut.cpp
+++ b/ydb/core/kqp/ut/scheme/kqp_scheme_ut.cpp
@@ -5518,7 +5518,7 @@ Y_UNIT_TEST_SUITE(KqpScheme) {
                 month Int64 NOT NULL
             ) WITH (
                 DATA_SOURCE=")" << externalDataSourceName << R"(",
-                LOCATION="/folder1/*",
+                LOCATION="/folder1/",
                 FORMAT="json_as_string",
                 `projection.enabled`="true",
                 `projection.year.type`="integer",
@@ -5543,7 +5543,7 @@ Y_UNIT_TEST_SUITE(KqpScheme) {
         UNIT_ASSERT(externalTable.ExternalTableInfo);
         UNIT_ASSERT_VALUES_EQUAL(externalTable.ExternalTableInfo->Description.ColumnsSize(), 4);
         UNIT_ASSERT_VALUES_EQUAL(externalTable.ExternalTableInfo->Description.GetDataSourcePath(), externalDataSourceName);
-        UNIT_ASSERT_VALUES_EQUAL(externalTable.ExternalTableInfo->Description.GetLocation(), "/folder1/*");
+        UNIT_ASSERT_VALUES_EQUAL(externalTable.ExternalTableInfo->Description.GetLocation(), "/folder1/");
     }
 
     Y_UNIT_TEST(CreateExternalTableWithUpperCaseSettings) {
@@ -5566,7 +5566,7 @@ Y_UNIT_TEST_SUITE(KqpScheme) {
                 Month Int64 NOT NULL
             ) WITH (
                 DATA_SOURCE=")" << externalDataSourceName << R"(",
-                LOCATION="/folder1/*",
+                LOCATION="/folder1/",
                 FORMAT="json_as_string",
                 `projection.enabled`="true",
                 `projection.Year.type`="integer",
@@ -5591,7 +5591,7 @@ Y_UNIT_TEST_SUITE(KqpScheme) {
         UNIT_ASSERT(externalTable.ExternalTableInfo);
         UNIT_ASSERT_VALUES_EQUAL(externalTable.ExternalTableInfo->Description.ColumnsSize(), 4);
         UNIT_ASSERT_VALUES_EQUAL(externalTable.ExternalTableInfo->Description.GetDataSourcePath(), externalDataSourceName);
-        UNIT_ASSERT_VALUES_EQUAL(externalTable.ExternalTableInfo->Description.GetLocation(), "/folder1/*");
+        UNIT_ASSERT_VALUES_EQUAL(externalTable.ExternalTableInfo->Description.GetLocation(), "/folder1/");
     }
 
     Y_UNIT_TEST(DoubleCreateExternalTable) {
diff --git a/ydb/core/protos/external_sources.proto b/ydb/core/protos/external_sources.proto
index 2115da12de95..9f01d56e7120 100644
--- a/ydb/core/protos/external_sources.proto
+++ b/ydb/core/protos/external_sources.proto
@@ -11,6 +11,7 @@ message TSchema {
 
 message TGeneral {
     map<string, string> attributes = 1 [(Ydb.size).le = 100];
+    optional string location = 2;
 }
 
 message TObjectStorage {
diff --git a/ydb/library/yql/providers/s3/object_listers/yql_s3_list.cpp b/ydb/library/yql/providers/s3/object_listers/yql_s3_list.cpp
index be5fd6134c2e..f62c12ea1d4c 100644
--- a/ydb/library/yql/providers/s3/object_listers/yql_s3_list.cpp
+++ b/ydb/library/yql/providers/s3/object_listers/yql_s3_list.cpp
@@ -47,6 +47,7 @@ std::pair<TPathFilter, TEarlyStopChecker> MakeFilterRegexp(const TString& regex,
     } else {
         re = std::make_shared<RE2>(re2::StringPiece(regex), RE2::Options());
     }
+    Y_ENSURE(re->ok());
 
     const size_t numGroups = re->NumberOfCapturingGroups();
     YQL_CLOG(DEBUG, ProviderS3)
diff --git a/ydb/library/yql/providers/s3/object_listers/yql_s3_path.cpp b/ydb/library/yql/providers/s3/object_listers/yql_s3_path.cpp
index e746aeeddec3..e472caef152f 100644
--- a/ydb/library/yql/providers/s3/object_listers/yql_s3_path.cpp
+++ b/ydb/library/yql/providers/s3/object_listers/yql_s3_path.cpp
@@ -52,13 +52,21 @@ TString RegexFromWildcards(const std::string_view& pattern) {
     for (const char& c : escaped) {
         switch (c) {
             case '{':
-                result << "(?:";
-                group = true;
+                if (group) {
+                    result << "\\{";
+                } else {
+                    result << "(?:";
+                    group = true;
+                }
                 slash = false;
                 break;
             case '}':
-                result << ')';
-                group = false;
+                if (group) {
+                    result << ')';
+                    group = false;
+                } else {
+                    result << "\\}";
+                }
                 slash = false;
                 break;
             case ',':
@@ -89,7 +97,24 @@ TString RegexFromWildcards(const std::string_view& pattern) {
                 break;
         }
     }
+    Y_ENSURE(!group, "Found unterminated group");
+    Y_ENSURE(!slash, "Expected symbol after slash");
     return result;
 }
 
+TString ValidateWildcards(const std::string_view& pattern) {
+    std::optional<size_t> groupStart;
+    for (size_t i = 0; i < pattern.size(); ++i) {
+        if (pattern[i] == '{' && !groupStart) {
+            groupStart = i;
+        } else if (pattern[i] == '}') {
+            groupStart = std::nullopt;
+        }
+    }
+    if (groupStart) {
+        return TStringBuilder() << "found unterminated group start at position " << *groupStart;
+    }
+    return {};
+}
+
 }
diff --git a/ydb/library/yql/providers/s3/object_listers/yql_s3_path.h b/ydb/library/yql/providers/s3/object_listers/yql_s3_path.h
index c39f476f8893..b5266607558f 100644
--- a/ydb/library/yql/providers/s3/object_listers/yql_s3_path.h
+++ b/ydb/library/yql/providers/s3/object_listers/yql_s3_path.h
@@ -19,5 +19,6 @@ TString EscapeRegex(const TString& str);
 TString EscapeRegex(const std::string_view& str);
 
 TString RegexFromWildcards(const std::string_view& pattern);
+TString ValidateWildcards(const std::string_view& pattern);
 
 }
diff --git a/ydb/library/yql/providers/s3/object_listers/yql_s3_path_ut.cpp b/ydb/library/yql/providers/s3/object_listers/yql_s3_path_ut.cpp
index 1b452a268364..d4aaa47800f5 100644
--- a/ydb/library/yql/providers/s3/object_listers/yql_s3_path_ut.cpp
+++ b/ydb/library/yql/providers/s3/object_listers/yql_s3_path_ut.cpp
@@ -28,6 +28,27 @@ Y_UNIT_TEST_SUITE(TPathTests) {
         UNIT_ASSERT_VALUES_EQUAL(NormalizePath("/a/b/c/"), "a/b/c/");
         UNIT_ASSERT_VALUES_EQUAL(NormalizePath("///a/b/c///"), "a/b/c/");
     }
+
+    void TestRegexFromWildcardsSuccess(const TString& wildcards, const TString& expectedRegex) {
+        TString errorString = ValidateWildcards(wildcards);
+        UNIT_ASSERT_C(errorString.empty(), errorString);
+        UNIT_ASSERT_VALUES_EQUAL(RegexFromWildcards(wildcards), expectedRegex);
+    }
+
+    void TestRegexFromWildcardsFail(const TString& wildcards, const TString& expectedException, const TString& expectedError) {
+        UNIT_ASSERT_STRING_CONTAINS(ValidateWildcards(wildcards), expectedError);
+        UNIT_ASSERT_EXCEPTION_CONTAINS(RegexFromWildcards(wildcards), yexception, expectedException);
+    }
+
+    Y_UNIT_TEST(TestRegexFromWildcards) {
+        TestRegexFromWildcardsSuccess("first,test\\_{alt1,alt2}_text", "first\\,test\\\\_(?:alt1|alt2)_text");
+        TestRegexFromWildcardsSuccess("hello.*world?str", "hello\\..*world.str");
+        TestRegexFromWildcardsSuccess("many_{},{alt1,al?t2,al*t3},{alt4}_alts", "many_(?:)\\,(?:alt1|al.t2|al.*t3)\\,(?:alt4)_alts");
+        TestRegexFromWildcardsSuccess("hello}{}}world", "hello\\}(?:)\\}world");
+        TestRegexFromWildcardsSuccess("hello{{{}world", "hello(?:\\{\\{)world");
+
+        TestRegexFromWildcardsFail("hello{}}{world", "Found unterminated group", "found unterminated group start at position 8");
+    }
 }
 
 }
diff --git a/ydb/library/yql/providers/s3/provider/yql_s3_io_discovery.cpp b/ydb/library/yql/providers/s3/provider/yql_s3_io_discovery.cpp
index 2c1ee3313622..436a116ecdf1 100644
--- a/ydb/library/yql/providers/s3/provider/yql_s3_io_discovery.cpp
+++ b/ydb/library/yql/providers/s3/provider/yql_s3_io_discovery.cpp
@@ -732,6 +732,10 @@ class TS3IODiscoveryTransformer : public TGraphTransformerBase {
         if (!FindFilePattern(settings, ctx, filePattern)) {
             return false;
         }
+        if (TString errorString = NS3::ValidateWildcards(filePattern)) {
+            ctx.AddError(TIssue(ctx.GetPosition(read.Pos()), TStringBuilder() << "File pattern '" << filePattern << "' contains invalid wildcard: " << errorString));
+            return false;
+        }
         const TString effectiveFilePattern = filePattern ? filePattern : "*";
 
         TVector<TString> paths;
@@ -763,6 +767,11 @@ class TS3IODiscoveryTransformer : public TGraphTransformerBase {
         }
 
         for (const auto& path : paths) {
+            if (TString errorString = NS3::ValidateWildcards(path)) {
+                ctx.AddError(TIssue(ctx.GetPosition(read.Pos()), TStringBuilder() << "Path '" << path << "' contains invalid wildcard: " << errorString));
+                return false;
+            }
+
             // each path in CONCAT() can generate multiple list requests for explicit partitioning
             TVector<TListRequest> reqs;