diff --git a/src/Integrations/Divi/Design/ThemeOptionSpec.php b/src/Integrations/Divi/Design/ThemeOptionSpec.php
index efeb8a6..473204e 100644
--- a/src/Integrations/Divi/Design/ThemeOptionSpec.php
+++ b/src/Integrations/Divi/Design/ThemeOptionSpec.php
@@ -239,7 +239,7 @@ final class ThemeOptionSpec
     {
         return match (true) {
             is_int($value), is_float($value) => $value,
-            is_string($value) && preg_match('/^-?\d+(\.\d+)?$/', $value) === 1 => $value + 0,
+            is_string($value) && preg_match('/^-?\d+(\.\d+)?$/D', $value) === 1 => $value + 0,
             default => null,
         };
     }
diff --git a/tests/Unit/Integrations/Divi/Design/ThemeOptionSpecTest.php b/tests/Unit/Integrations/Divi/Design/ThemeOptionSpecTest.php
index 2e7fc8d..04e9401 100644
--- a/tests/Unit/Integrations/Divi/Design/ThemeOptionSpecTest.php
+++ b/tests/Unit/Integrations/Divi/Design/ThemeOptionSpecTest.php
@@ -147,6 +147,8 @@ final class ThemeOptionSpecTest extends TestCase
             'unit suffix' => ['body_font_size', '15px', 'erwartet eine Zahl'],
             'exponent' => ['body_font_size', '1e1', 'erwartet eine Zahl'],
             'spaces around digits' => ['body_font_size', ' 15', 'erwartet eine Zahl'],
+            'trailing space' => ['body_font_size', '15 ', 'erwartet eine Zahl'],
+            'trailing newline' => ['body_font_size', "15\n", 'erwartet eine Zahl'],
             'empty text' => ['gutter_width', '', 'erwartet eine Zahl'],
             'true' => ['body_font_size', true, 'erhalten true'],
             'false' => ['body_font_size', false, 'erhalten false'],