Fixed Inflector::slug to work properly with numbers

framework/helpers/BaseInflector.php

@@ -415,7 +415,7 @@ class BaseInflector
     public static function slug($string, $replacement = '-', $lowercase = true)
     {
         $string = static::transliterate($string);
-        $string = preg_replace('/[^a-zA-Z=\s—–-]+/u', '', $string);
+        $string = preg_replace('/[^a-zA-Z0-9=\s—–-]+/u', '', $string);
         $string = preg_replace('/[=\s—–-]+/u', $replacement, $string);
         $string = trim($string, $replacement);
 

tests/unit/framework/helpers/InflectorTest.php

@@ -126,7 +126,7 @@ class InflectorTest extends TestCase
     {
         $data = [
             '' => '',
-            'hello world' => 'hello-world',
+            'hello world 123' => 'hello-world-123',
             'remove.!?[]{}…symbols' => 'removesymbols',
             'minus-sign' => 'minus-sign',
             'mdash—sign' => 'mdash-sign',