diff --git a/app/code/Magento/Catalog/Test/Unit/Model/ProductOptions/Config/_files/invalidProductOptionsXmlArray.php b/app/code/Magento/Catalog/Test/Unit/Model/ProductOptions/Config/_files/invalidProductOptionsXmlArray.php
index 034b04b6a757d..cfb54c3aefd0f 100644
--- a/app/code/Magento/Catalog/Test/Unit/Model/ProductOptions/Config/_files/invalidProductOptionsXmlArray.php
+++ b/app/code/Magento/Catalog/Test/Unit/Model/ProductOptions/Config/_files/invalidProductOptionsXmlArray.php
@@ -29,12 +29,12 @@
         ],
     ],
     'renderer_attribute_with_invalid_value' => [
-        '<?xml version="1.0"?><config><option name="name_one" renderer="true12"><inputType name="name_one"/>' .
+        '<?xml version="1.0"?><config><option name="name_one" renderer="123true"><inputType name="name_one"/>' .
         '</option></config>',
         [
-            "Element 'option', attribute 'renderer': [facet 'pattern'] The value 'true12' is not accepted by the " .
-            "pattern '[a-zA-Z_\\\\]+'.\nLine: 1\n",
-            "Element 'option', attribute 'renderer': 'true12' is not a valid value of the atomic" .
+            "Element 'option', attribute 'renderer': [facet 'pattern'] The value '123true' is not accepted by the " .
+            "pattern '([\\\\]?[a-zA-Z_][a-zA-Z0-9_]*)+'.\nLine: 1\n",
+            "Element 'option', attribute 'renderer': '123true' is not a valid value of the atomic" .
             " type 'modelName'.\nLine: 1\n"
         ],
     ],
diff --git a/app/code/Magento/Catalog/Test/Unit/Model/ProductTypes/Config/_files/invalidProductTypesXmlArray.php b/app/code/Magento/Catalog/Test/Unit/Model/ProductTypes/Config/_files/invalidProductTypesXmlArray.php
index e1847bea53fcb..868252da8190c 100644
--- a/app/code/Magento/Catalog/Test/Unit/Model/ProductTypes/Config/_files/invalidProductTypesXmlArray.php
+++ b/app/code/Magento/Catalog/Test/Unit/Model/ProductTypes/Config/_files/invalidProductTypesXmlArray.php
@@ -23,7 +23,7 @@
         '<?xml version="1.0"?><config><type name="some_name" modelInstance="123" /></config>',
         [
             "Element 'type', attribute 'modelInstance': [facet 'pattern'] The value '123' is not accepted by the" .
-            " pattern '[a-zA-Z_\\\\]+'.\nLine: 1\n",
+            " pattern '([\\\\]?[a-zA-Z_][a-zA-Z0-9_]*)+'.\nLine: 1\n",
             "Element 'type', attribute 'modelInstance': '123' is not a valid value of the atomic type" .
             " 'modelName'.\nLine: 1\n"
         ],
@@ -57,7 +57,7 @@
         '<?xml version="1.0"?><config><type name="some_name"><priceModel instance="123123" /></type></config>',
         [
             "Element 'priceModel', attribute 'instance': [facet 'pattern'] The value '123123' is not accepted " .
-            "by the pattern '[a-zA-Z_\\\\]+'.\nLine: 1\n",
+            "by the pattern '([\\\\]?[a-zA-Z_][a-zA-Z0-9_]*)+'.\nLine: 1\n",
             "Element 'priceModel', attribute 'instance': '123123' is not a valid value of the atomic type" .
             " 'modelName'.\nLine: 1\n"
         ],
@@ -66,7 +66,7 @@
         '<?xml version="1.0"?><config><type name="some_name"><indexerModel instance="123" /></type></config>',
         [
             "Element 'indexerModel', attribute 'instance': [facet 'pattern'] The value '123' is not accepted by " .
-            "the pattern '[a-zA-Z_\\\\]+'.\nLine: 1\n",
+            "the pattern '([\\\\]?[a-zA-Z_][a-zA-Z0-9_]*)+'.\nLine: 1\n",
             "Element 'indexerModel', attribute 'instance': '123' is not a valid value of the atomic type" .
             " 'modelName'.\nLine: 1\n"
         ],
@@ -83,7 +83,7 @@
         '<?xml version="1.0"?><config><type name="some_name"><stockIndexerModel instance="1234"/></type></config>',
         [
             "Element 'stockIndexerModel', attribute 'instance': [facet 'pattern'] The value '1234' is not " .
-            "accepted by the pattern '[a-zA-Z_\\\\]+'.\nLine: 1\n",
+            "accepted by the pattern '([\\\\]?[a-zA-Z_][a-zA-Z0-9_]*)+'.\nLine: 1\n",
             "Element 'stockIndexerModel', attribute 'instance': '1234' is not a valid value of the atomic " .
             "type 'modelName'.\nLine: 1\n"
         ],
diff --git a/app/code/Magento/Catalog/Test/Unit/Model/ProductTypes/Config/_files/valid_product_types_merged.xml b/app/code/Magento/Catalog/Test/Unit/Model/ProductTypes/Config/_files/valid_product_types_merged.xml
index 7edbc399a9476..701338774baa5 100644
--- a/app/code/Magento/Catalog/Test/Unit/Model/ProductTypes/Config/_files/valid_product_types_merged.xml
+++ b/app/code/Magento/Catalog/Test/Unit/Model/ProductTypes/Config/_files/valid_product_types_merged.xml
@@ -15,6 +15,14 @@
         <stockIndexerModel instance="instance_name"/>
     </type>
     <type label="some_label" name="some_name2" modelInstance="model_name">
+        <allowedSelectionTypes>
+            <type name="some_name" />
+        </allowedSelectionTypes>
+        <priceModel instance="instance_name_with_digits_123" />
+        <indexerModel instance="instance_name_with_digits_123" />
+        <stockIndexerModel instance="instance_name_with_digits_123"/>
+    </type>
+    <type label="some_label" name="some_name3" modelInstance="model_name">
         <allowedSelectionTypes>
             <type name="some_name" />
         </allowedSelectionTypes>
@@ -25,5 +33,6 @@
     <composableTypes>
         <type name="some_name"/>
         <type name="some_name2"/>
+        <type name="some_name3"/>
     </composableTypes>
 </config>
diff --git a/app/code/Magento/Catalog/etc/product_options.xsd b/app/code/Magento/Catalog/etc/product_options.xsd
index 3bc24a9099262..734c8f378d5d7 100644
--- a/app/code/Magento/Catalog/etc/product_options.xsd
+++ b/app/code/Magento/Catalog/etc/product_options.xsd
@@ -61,11 +61,11 @@
     <xs:simpleType name="modelName">
         <xs:annotation>
             <xs:documentation>
-                Model name can contain only [a-zA-Z_\\].
+                Model name can contain only ([\\]?[a-zA-Z_][a-zA-Z0-9_]*)+.
             </xs:documentation>
         </xs:annotation>
         <xs:restriction base="xs:string">
-            <xs:pattern value="[a-zA-Z_\\]+" />
+            <xs:pattern value="([\\]?[a-zA-Z_][a-zA-Z0-9_]*)+" />
         </xs:restriction>
     </xs:simpleType>
 </xs:schema>
diff --git a/app/code/Magento/Catalog/etc/product_types_base.xsd b/app/code/Magento/Catalog/etc/product_types_base.xsd
index 6cc35fd7bee37..dec952bcf492e 100644
--- a/app/code/Magento/Catalog/etc/product_types_base.xsd
+++ b/app/code/Magento/Catalog/etc/product_types_base.xsd
@@ -92,11 +92,11 @@
     <xs:simpleType name="modelName">
         <xs:annotation>
             <xs:documentation>
-                Model name can contain only [a-zA-Z_\\].
+                Model name can contain only ([\\]?[a-zA-Z_][a-zA-Z0-9_]*)+.
             </xs:documentation>
         </xs:annotation>
         <xs:restriction base="xs:string">
-            <xs:pattern value="[a-zA-Z_\\]+" />
+            <xs:pattern value="([\\]?[a-zA-Z_][a-zA-Z0-9_]*)+" />
         </xs:restriction>
     </xs:simpleType>
 </xs:schema>
diff --git a/app/code/Magento/ImportExport/Test/Unit/Model/Export/Config/_files/invalidExportXmlArray.php b/app/code/Magento/ImportExport/Test/Unit/Model/Export/Config/_files/invalidExportXmlArray.php
index 288a99770974a..179f3f3cadab0 100644
--- a/app/code/Magento/ImportExport/Test/Unit/Model/Export/Config/_files/invalidExportXmlArray.php
+++ b/app/code/Magento/ImportExport/Test/Unit/Model/Export/Config/_files/invalidExportXmlArray.php
@@ -22,15 +22,15 @@
     'attributes_with_type_modelName_and_invalid_value' => [
         '<?xml version="1.0"?><config><entity name="Name/one" model="model_one" '
             . 'entityAttributeFilterType="model_one"/><entityType entity="Name/one" name="name_one" model="1"/>'
-            . ' <fileFormat name="name_one" model="model1"/></config>',
+            . ' <fileFormat name="name_one" model="1model"/></config>',
         [
             "Element 'entityType', attribute 'model': [facet 'pattern'] The value '1' is not accepted by the " .
-            "pattern '[A-Za-z_\\\\]+'.\nLine: 1\n",
+            "pattern '([\\\\]?[a-zA-Z_][a-zA-Z0-9_]*)+'.\nLine: 1\n",
             "Element 'entityType', attribute 'model': '1' is not a valid value of the atomic type" .
             " 'modelName'.\nLine: 1\n",
-            "Element 'fileFormat', attribute 'model': [facet 'pattern'] The value 'model1' is not " .
-            "accepted by the pattern '[A-Za-z_\\\\]+'.\nLine: 1\n",
-            "Element 'fileFormat', attribute 'model': 'model1' is not a valid " .
+            "Element 'fileFormat', attribute 'model': [facet 'pattern'] The value '1model' is not " .
+            "accepted by the pattern '([\\\\]?[a-zA-Z_][a-zA-Z0-9_]*)+'.\nLine: 1\n",
+            "Element 'fileFormat', attribute 'model': '1model' is not a valid " .
             "value of the atomic type 'modelName'.\nLine: 1\n"
         ],
     ],
diff --git a/app/code/Magento/ImportExport/Test/Unit/Model/Import/Config/_files/invalidImportMergedXmlArray.php b/app/code/Magento/ImportExport/Test/Unit/Model/Import/Config/_files/invalidImportMergedXmlArray.php
index 357b35e8a313c..409c1af9cb38a 100644
--- a/app/code/Magento/ImportExport/Test/Unit/Model/Import/Config/_files/invalidImportMergedXmlArray.php
+++ b/app/code/Magento/ImportExport/Test/Unit/Model/Import/Config/_files/invalidImportMergedXmlArray.php
@@ -26,12 +26,12 @@
         ["Element 'entity', attribute 'notallowed': The attribute 'notallowed' is not allowed.\nLine: 1\n"],
     ],
     'entity_model_with_invalid_value' => [
-        '<?xml version="1.0"?><config><entity name="test_name" label="test_label" model="afwer34" ' .
+        '<?xml version="1.0"?><config><entity name="test_name" label="test_label" model="34afwer" ' .
         'behaviorModel="test" /></config>',
         [
-            "Element 'entity', attribute 'model': [facet 'pattern'] The value 'afwer34' is not " .
-            "accepted by the pattern '[A-Za-z_\\\\]+'.\nLine: 1\n",
-            "Element 'entity', attribute 'model': 'afwer34' is not a valid value of the atomic type" .
+            "Element 'entity', attribute 'model': [facet 'pattern'] The value '34afwer' is not " .
+            "accepted by the pattern '([\\\\]?[a-zA-Z_][a-zA-Z0-9_]*)+'.\nLine: 1\n",
+            "Element 'entity', attribute 'model': '34afwer' is not a valid value of the atomic type" .
             " 'modelName'.\nLine: 1\n"
         ],
     ],
@@ -40,7 +40,7 @@
         '</config>',
         [
             "Element 'entity', attribute 'behaviorModel': [facet 'pattern'] The value '666' is not accepted by " .
-            "the pattern '[A-Za-z_\\\\]+'.\nLine: 1\n",
+            "the pattern '([\\\\]?[a-zA-Z_][a-zA-Z0-9_]*)+'.\nLine: 1\n",
             "Element 'entity', attribute 'behaviorModel': '666' is not a valid value of the atomic type" .
             " 'modelName'.\nLine: 1\n"
         ],
diff --git a/app/code/Magento/ImportExport/Test/Unit/Model/Import/Config/_files/invalidImportXmlArray.php b/app/code/Magento/ImportExport/Test/Unit/Model/Import/Config/_files/invalidImportXmlArray.php
index c913b53e8b531..c7b06a8731f02 100644
--- a/app/code/Magento/ImportExport/Test/Unit/Model/Import/Config/_files/invalidImportXmlArray.php
+++ b/app/code/Magento/ImportExport/Test/Unit/Model/Import/Config/_files/invalidImportXmlArray.php
@@ -19,7 +19,7 @@
         '<?xml version="1.0"?><config><entity name="some_name" model="12345"/></config>',
         [
             "Element 'entity', attribute 'model': [facet 'pattern'] The value '12345' is not accepted by " .
-            "the pattern '[A-Za-z_\\\\]+'.\nLine: 1\n",
+            "the pattern '([\\\\]?[a-zA-Z_][a-zA-Z0-9_]*)+'.\nLine: 1\n",
             "Element 'entity', attribute 'model': '12345' is not a valid value of the atomic type" .
             " 'modelName'.\nLine: 1\n"
         ],
@@ -28,7 +28,7 @@
         '<?xml version="1.0"?><config><entity name="some_name" behaviorModel="=--09"/></config>',
         [
             "Element 'entity', attribute 'behaviorModel': [facet 'pattern'] The value '=--09' is not " .
-            "accepted by the pattern '[A-Za-z_\\\\]+'.\nLine: 1\n",
+            "accepted by the pattern '([\\\\]?[a-zA-Z_][a-zA-Z0-9_]*)+'.\nLine: 1\n",
             "Element 'entity', attribute 'behaviorModel': '=--09' is not a valid value of the atomic type" .
             " 'modelName'.\nLine: 1\n"
         ],
@@ -46,11 +46,11 @@
         ["Element 'entityType': The attribute 'model' is required but missing.\nLine: 1\n"],
     ],
     'entitytype_with_invalid_model_attribute_value' => [
-        '<?xml version="1.0"?><config><entityType entity="entity_name" name="some_name" model="test1"/></config>',
+        '<?xml version="1.0"?><config><entityType entity="entity_name" name="some_name" model="1test"/></config>',
         [
-            "Element 'entityType', attribute 'model': [facet 'pattern'] The value 'test1' is not " .
-            "accepted by the pattern '[A-Za-z_\\\\]+'.\nLine: 1\n",
-            "Element 'entityType', attribute 'model': 'test1' is not a valid value of the atomic type" .
+            "Element 'entityType', attribute 'model': [facet 'pattern'] The value '1test' is not " .
+            "accepted by the pattern '([\\\\]?[a-zA-Z_][a-zA-Z0-9_]*)+'.\nLine: 1\n",
+            "Element 'entityType', attribute 'model': '1test' is not a valid value of the atomic type" .
             " 'modelName'.\nLine: 1\n"
         ],
     ],
diff --git a/app/code/Magento/ImportExport/etc/export.xsd b/app/code/Magento/ImportExport/etc/export.xsd
index 65728a9be5c62..f62dbc891ef0f 100644
--- a/app/code/Magento/ImportExport/etc/export.xsd
+++ b/app/code/Magento/ImportExport/etc/export.xsd
@@ -71,11 +71,11 @@
     <xs:simpleType name="modelName">
         <xs:annotation>
             <xs:documentation>
-                Model name can contain only [A-Za-z_\\].
+                Model name can contain only ([\\]?[a-zA-Z_][a-zA-Z0-9_]*)+.
             </xs:documentation>
         </xs:annotation>
         <xs:restriction base="xs:string">
-            <xs:pattern value="[A-Za-z_\\]+" />
+            <xs:pattern value="([\\]?[a-zA-Z_][a-zA-Z0-9_]*)+" />
         </xs:restriction>
     </xs:simpleType>
 </xs:schema>
diff --git a/app/code/Magento/ImportExport/etc/import.xsd b/app/code/Magento/ImportExport/etc/import.xsd
index aefa6541d7e13..e73038ebc0710 100644
--- a/app/code/Magento/ImportExport/etc/import.xsd
+++ b/app/code/Magento/ImportExport/etc/import.xsd
@@ -61,11 +61,11 @@
     <xs:simpleType name="modelName">
         <xs:annotation>
             <xs:documentation>
-                Model name can contain only [A-Za-z_\\].
+                Model name can contain only ([\\]?[a-zA-Z_][a-zA-Z0-9_]*)+.
             </xs:documentation>
         </xs:annotation>
         <xs:restriction base="xs:string">
-            <xs:pattern value="[A-Za-z_\\]+" />
+            <xs:pattern value="([\\]?[a-zA-Z_][a-zA-Z0-9_]*)+" />
         </xs:restriction>
     </xs:simpleType>
 </xs:schema>