diff --git a/bridges/XPathBridge.php b/bridges/XPathBridge.php
index 35ec6ad1001..d4a2dfb5a3c 100644
--- a/bridges/XPathBridge.php
+++ b/bridges/XPathBridge.php
@@ -17,7 +17,6 @@ class XPathBridge extends XPathAbstract
 (for example a news blog).
 EOL, 'type' => 'text',
                 'exampleValue' => 'https://news.blizzard.com/en-en',
-                'defaultValue' => 'https://news.blizzard.com/en-en',
                 'required' => true
             ],
 
@@ -30,7 +29,6 @@ class XPathBridge extends XPathAbstract
 starts with a single forward slash.
 EOL, 'type' => 'text',
                 'exampleValue' => '/html/body/div/div[4]/div[2]/div[2]/div/div/section/ol/li/article',
-                'defaultValue' => '/html/body/div/div[4]/div[2]/div[2]/div/div/section/ol/li/article',
                 'required' => true
             ],
 
@@ -42,7 +40,6 @@ class XPathBridge extends XPathAbstract
 forward slashes, referring to any descendant nodes of the article item node.
 EOL, 'type' => 'text',
                 'exampleValue' => './/div/div[2]/h2',
-                'defaultValue' => './/div/div[2]/h2',
                 'required' => true
             ],
 
@@ -55,7 +52,6 @@ class XPathBridge extends XPathAbstract
 article item node.
 EOL, 'type' => 'text',
                 'exampleValue' => './/div[@class="ArticleListItem-description"]/div[@class="h6"]',
-                'defaultValue' => './/div[@class="ArticleListItem-description"]/div[@class="h6"]',
                 'required' => false
             ],
 
@@ -80,7 +76,6 @@ class XPathBridge extends XPathAbstract
 before the attributes name.
 EOL, 'type' => 'text',
                 'exampleValue' => './/a[@class="ArticleLink ArticleLink"]/@href',
-                'defaultValue' => './/a[@class="ArticleLink ArticleLink"]/@href',
                 'required' => false
             ],
 
@@ -105,7 +100,6 @@ class XPathBridge extends XPathAbstract
 selected by prepending an @ char before the attributes name.
 EOL, 'type' => 'text',
                 'exampleValue' => './/time[@class="ArticleListItem-footerTimestamp"]/@timestamp',
-                'defaultValue' => './/time[@class="ArticleListItem-footerTimestamp"]/@timestamp',
                 'required' => false
             ],
 
@@ -119,7 +113,6 @@ class XPathBridge extends XPathAbstract
 can be selected by prepending an @ char before the attributes name.
 EOL, 'type' => 'text',
                 'exampleValue' => './/div[@class="ArticleListItem-image"]/@style',
-                'defaultValue' => './/div[@class="ArticleListItem-image"]/@style',
                 'required' => false
             ],
 
@@ -134,8 +127,7 @@ class XPathBridge extends XPathAbstract
 item node. Attributes can be selected by prepending an @ char
 before the attributes name.
 EOL, 'type' => 'text',
-                'exampleValue' => './/div[@class="ArticleListItem-label"]',
-                'defaultValue' => './/div[@class="ArticleListItem-label"]',
+                'exampleValue' => 'polyfill:function("replace", .//div[@class="ArticleListItem-label"], "(diablo immortal|warcraft rumble)", "$1 (Mobile)", "i")',
                 'required' => false
             ],
 
@@ -186,7 +178,7 @@ protected function getExpressionItemTitle()
      */
     protected function getExpressionItemContent()
     {
-        return urldecode($this->getInput('content'));
+        return urldecode($this->getInput('content') ?? '');
     }
 
     /**
@@ -204,7 +196,7 @@ protected function getSettingUseRawItemContent(): bool
      */
     protected function getExpressionItemUri()
     {
-        return urldecode($this->getInput('uri'));
+        return urldecode($this->getInput('uri') ?? '');
     }
 
     /**
@@ -213,7 +205,7 @@ protected function getExpressionItemUri()
      */
     protected function getExpressionItemAuthor()
     {
-        return urldecode($this->getInput('author'));
+        return urldecode($this->getInput('author') ?? '');
     }
 
     /**
@@ -222,7 +214,7 @@ protected function getExpressionItemAuthor()
      */
     protected function getExpressionItemTimestamp()
     {
-        return urldecode($this->getInput('timestamp'));
+        return urldecode($this->getInput('timestamp') ?? '');
     }
 
     /**
@@ -232,7 +224,7 @@ protected function getExpressionItemTimestamp()
      */
     protected function getExpressionItemEnclosures()
     {
-        return urldecode($this->getInput('enclosures'));
+        return urldecode($this->getInput('enclosures') ?? '');
     }
 
     /**
@@ -241,7 +233,7 @@ protected function getExpressionItemEnclosures()
      */
     protected function getExpressionItemCategories()
     {
-        return urldecode($this->getInput('categories'));
+        return urldecode($this->getInput('categories') ?? '');
     }
 
     /**
diff --git a/lib/XPathAbstract.php b/lib/XPathAbstract.php
index 44cbab674bc..416ed500098 100644
--- a/lib/XPathAbstract.php
+++ b/lib/XPathAbstract.php
@@ -411,6 +411,7 @@ public function collectData()
         defaultLinkTo($webPageHtml, $webPageHtml->baseURI ?? $this->feedUri);
 
         $xpath = new \DOMXPath($webPageHtml);
+        $this->registerXPathPolyfills($xpath);
 
         $this->feedName = $this->provideFeedTitle($xpath);
         $this->feedIcon = $this->provideFeedIcon($xpath);
@@ -661,4 +662,60 @@ protected function generateItemId(array $item)
     {
         return null;
     }
+
+    /**
+     * Adds xpath polyfills to the given DOMXPath instance
+     *
+     * @param DOMXPath $xpath
+     * @return void
+     */
+    protected function registerXPathPolyfills(DOMXPath $xpath)
+    {
+        $xpath->registerNamespace('polyfill', 'http://php.net/xpath');
+
+        // https://www.w3.org/TR/xpath-functions-31/#func-replace
+        function replace($input, $pattern, $replacement, $flags = null)
+        {
+            $exceptionSuffix = ' [xpath polyfill for fn:replace]';
+
+            if (is_array($input) && count($input) !== 1) {
+                throw new \Exception('input not supported' . $exceptionSuffix);
+            }
+            $input = is_array($input) ? $input[0] : $input;
+
+            if (is_string($input)) {
+                $text = $input;
+            } elseif ($input instanceof \DOMElement) {
+                $text = $input->textContent;
+            } elseif ($input instanceof \DOMAttr) {
+                $text = $input->value;
+            } elseif ($input instanceof \DOMText) {
+                $text = $input->wholeText;
+            } else {
+                throw new \Exception('input not supported' . $exceptionSuffix);
+            }
+
+            if (!is_string($pattern)) {
+                throw new \Exception('pattern (regular expression) must be a string' . $exceptionSuffix);
+            }
+
+            if (!is_string($replacement)) {
+                throw new \Exception('replacement must be a string' . $exceptionSuffix);
+            }
+
+            $flags ??= '';
+            if (!is_string($flags)) {
+                throw new \Exception('flags (regular expression) must be a string' . $exceptionSuffix);
+            }
+
+            $modified = preg_replace(sprintf('/%s/%s', $pattern, $flags), $replacement, $text);
+            if ($modified == null) {
+                throw new \Exception('pattern (regular expression) is invalid' . $exceptionSuffix);
+            }
+
+            return $modified;
+        }
+
+        $xpath->registerPHPFunctions(['replace']);
+    }
 }