MC-17947: Search by email is working incorrect in Sales > Orders grid

Author: nikita-shcherbatykh

app/code/Magento/Customer/Test/Mftf/Test/SearchByEmailInCustomerGridTest.xml

@@ -10,7 +10,7 @@
     <test name="SearchByEmailInCustomerGridTest">
         <annotations>
             <features value="Customer"/>
-            <stories value="Customer Search email searching"/>
+            <stories value="Customer grid search"/>
             <title value="Admin customer grid email searching"/>
             <description value="Admin customer grid searching by email in keyword"/>
             <severity value="MAJOR"/>
@@ -19,12 +19,8 @@
             <group value="customer"/>
         </annotations>
         <before>
-            <createData entity="Simple_US_Customer" stepKey="createFirstCustomer">
-                <field key="email">[email protected]</field>
-            </createData>
-            <createData entity="Simple_US_Customer" stepKey="createSecondCustomer">
-                <field key="email">[email protected]</field>
-            </createData>
+            <createData entity="Simple_US_Customer" stepKey="createFirstCustomer"/>
+            <createData entity="Simple_US_Customer" stepKey="createSecondCustomer"/>
             <actionGroup ref="LoginAsAdmin" stepKey="login"/>
         </before>
         <after>

lib/internal/Magento/Framework/View/Element/UiComponent/DataProvider/FulltextFilter.php

@@ -15,6 +15,11 @@
  */
 class FulltextFilter implements FilterApplierInterface
 {
+    /**
+     * Patterns using in preg_replace for emails
+     */
+    private const EMAIL_REPLACE_PATTERNS = ['/@/', '/\./'];
+
     /**
      * Returns list of columns from fulltext index (doesn't support more then one FTI per table)
      *
@@ -71,7 +76,7 @@ function ($column) use ($alias) {
     private function escapeAgainstValue(string $value): string
     {
         $value = preg_replace('/([+\-><\(\)~*]+)/', ' ', $value);
-        return preg_replace('/(@)/', '\_', $value);
+        return preg_replace(self::EMAIL_REPLACE_PATTERNS, '\_', $value);
     }
 
     /**