ACP2E-345: Unable to save product URL key with a hyphen "-" at end.

- Added tooltip for message and link to follow for more info.
- Updated validation to just validate trailing hyphen in the URL key.

Author: Mohan Ahuja

app/code/Magento/Catalog/Setup/Patch/Data/UpdateProductUrlKey.php

@@ -52,8 +52,7 @@ public function apply()
             \Magento\Catalog\Model\Product::ENTITY,
             'url_key',
             [
-                'note' => 'The URL key should consist of lowercase characters with hyphens to separate words',
-                'frontend_class' => 'validate-identifier-clean'
+                'frontend_class' => 'validate-trailing-hyphen'
             ]
         );
         return $this;

app/code/Magento/Catalog/Ui/DataProvider/CatalogEavValidationRules.php

@@ -70,7 +70,7 @@ protected function mapRules($class, array $rules)
             case 'validate-digits':
             case 'validate-email':
             case 'validate-url':
-            case 'validate-identifier-clean':
+            case 'validate-trailing-hyphen':
             case 'validate-alpha':
             case 'validate-alphanum':
                 $rules = array_merge($rules, [$class => true]);

app/code/Magento/Catalog/Ui/DataProvider/Product/Form/Modifier/General.php

@@ -150,6 +150,7 @@ public function modifyMeta(array $meta)
         $meta = $this->customizeWeightField($meta);
         $meta = $this->customizeNewDateRangeField($meta);
         $meta = $this->customizeNameListeners($meta);
+        $meta = $this->customizeUrlKeyField($meta);
 
         return $meta;
     }
@@ -399,6 +400,31 @@ protected function customizeNameListeners(array $meta)
         );
     }
 
+    /**
+     * Customize URL KEY field
+     *
+     * @param  array $meta
+     * @return array
+     * @since  101.0.0
+     */
+    protected function customizeUrlKeyField(array $meta): array
+    {
+        $tooltip = [
+            'link' => 'https://docs.magento.com/user-guide/catalog/catalog-urls.html',
+            'description' => __(
+                'The URL key should consist of lowercase characters with hyphens to separate words.'
+            ),
+        ];
+        $switcherConfig = [
+            'tooltip' => $tooltip,
+        ];
+
+        $path = $this->arrayManager->findPath(ProductAttributeInterface::CODE_SEO_FIELD_URL_KEY, $meta, null, 'children');
+        $meta = $this->arrayManager->merge($path . static::META_CONFIG_PATH, $meta, $switcherConfig);
+
+        return $meta;
+    }
+
     /**
      * The getter function to get the locale currency for real application code
      *

app/code/Magento/Ui/view/base/web/js/lib/validation/rules.js

@@ -817,9 +817,9 @@ define([
             },
             $.mage.__('Please enter a valid URL Key (Ex: "example-page", "example-page.html" or "anotherlevel/example-page").')//eslint-disable-line max-len
         ],
-        'validate-identifier-clean': [
+        'validate-trailing-hyphen': [
             function (value) {
-                return utils.isEmptyNoTrim(value) || /^[a-z0-9]+(-[a-z0-9]+)*$/.test(value);
+                return utils.isEmptyNoTrim(value) || /^(?!-)(?!.*-$).+$/.test(value);
             },
             $.mage.__('Please enter a valid URL Key (Ex: example-page).')
         ],