diff --git a/src/Form/AppCallbackUrlSettingsForm.php b/src/Form/AppCallbackUrlSettingsForm.php
index 345e7a10..17d89c08 100644
--- a/src/Form/AppCallbackUrlSettingsForm.php
+++ b/src/Form/AppCallbackUrlSettingsForm.php
@@ -61,7 +61,7 @@ public function buildForm(array $form, FormStateInterface $form_state) {
       '#type' => 'textfield',
       '#title' => $this->t('Pattern'),
       '#default_value' => $app_settings->get('callback_url_pattern'),
-      '#description' => $this->t('Regular expression that a Callback URL should match. Default is "^https?:\/\/.*$" that ensures callback url starts with either <em>http://</em> or <em>https://</em>.'),
+      '#description' => $this->t('Regular expression that a Callback URL should match. Default is "^https?:\/\/.*$" that ensures callback url starts with either <em>http://</em> or <em>https://</em>. Avoid using delimiters.'),
       '#required' => TRUE,
     ];
     $form['callback_url']['pattern_error_message'] = [
@@ -94,12 +94,8 @@ public function validateForm(array &$form, FormStateInterface $form_state) {
     parent::validateForm($form, $form_state);
 
     $isRegExValid = FALSE;
-    $callback_url_pattern = $form_state->getValue(['callback_url', 'pattern']);
-    if (str_starts_with($callback_url_pattern, '/') && str_ends_with($callback_url_pattern, '/')) {
-      $callback_url_pattern = substr($callback_url_pattern, 1, -1);
-    }
     try {
-      if (@preg_match('/' . $callback_url_pattern . '/', '') !== FALSE) {
+      if (@preg_match('/' . $form_state->getValue(['callback_url', 'pattern']) . '/', '') !== FALSE) {
         $isRegExValid = TRUE;
       }
     }
diff --git a/src/Plugin/Field/FieldWidget/AppCallbackUrlWidget.php b/src/Plugin/Field/FieldWidget/AppCallbackUrlWidget.php
index c99bc39c..52d51a0e 100644
--- a/src/Plugin/Field/FieldWidget/AppCallbackUrlWidget.php
+++ b/src/Plugin/Field/FieldWidget/AppCallbackUrlWidget.php
@@ -85,11 +85,7 @@ public function formElement(FieldItemListInterface $items, $delta, array $elemen
     // Fallback to the default configuration if field widget does
     // not have an override.
     $app_settings = \Drupal::config("apigee_edge.common_app_settings");
-    $callback_url_pattern = $this->getSetting('callback_url_pattern') ?? $app_settings->get('callback_url_pattern');
-    if (substr($callback_url_pattern, 0, 1) === '/' && substr($callback_url_pattern, -1) === '/') {
-      $callback_url_pattern = substr($callback_url_pattern, 1, -1);
-    }
-    $element['value']['#pattern'] = $callback_url_pattern;
+    $element['value']['#pattern'] = $this->getSetting('callback_url_pattern') ?? $app_settings->get('callback_url_pattern');
     $element['value']['#attributes']['title'] = $this->getSetting('callback_url_pattern_error_message') ?? $app_settings->get('callback_url_pattern_error_message');
     $element['value']['#placeholder'] = $this->getSetting('placeholder') ?? $app_settings->get('callback_url_placeholder');
     $element['value']['#description'] = $this->getSetting('callback_url_description') ?? $app_settings->get('callback_url_description');