refactor: extract getRegex()

Author: kenjis

system/Validation/Validation.php

@@ -170,16 +170,9 @@ public function run(?array $data = null, ?string $group = null, ?string $dbGroup
             if (strpos($field, '*') !== false) {
                 $flattenedArray = array_flatten_with_dots($data);
 
-                $pattern = '/\A'
-                    . str_replace(
-                        ['\.\*', '\*\.'],
-                        ['\.[^.]+', '[^.]+\.'],
-                        preg_quote($field, '/')
-                    )
-                    . '\z/';
                 $values = array_filter(
                     $flattenedArray,
-                    static fn ($key) => preg_match($pattern, $key),
+                    static fn ($key) => preg_match($this->getRegex($field), $key),
                     ARRAY_FILTER_USE_KEY
                 );
 
@@ -220,6 +213,20 @@ public function run(?array $data = null, ?string $group = null, ?string $dbGroup
         return false;
     }
 
+    /**
+     * Returns regex pattern for key with dot array syntax.
+     */
+    private function getRegex(string $field): string
+    {
+        return '/\A'
+            . str_replace(
+                ['\.\*', '\*\.'],
+                ['\.[^.]+', '[^.]+\.'],
+                preg_quote($field, '/')
+            )
+            . '\z/';
+    }
+
     /**
      * Runs the validation process, returning true or false determining whether
      * validation was successful or not.
@@ -823,15 +830,7 @@ private function retrievePlaceholders(string $rule, array $data): array
      */
     public function hasError(string $field): bool
     {
-        $pattern = '/\A'
-            . str_replace(
-                ['\.\*', '\*\.'],
-                ['\.[^.]+', '[^.]+\.'],
-                preg_quote($field, '/')
-            )
-            . '\z/';
-
-        return (bool) preg_grep($pattern, array_keys($this->getErrors()));
+        return (bool) preg_grep($this->getRegex($field), array_keys($this->getErrors()));
     }
 
     /**
@@ -844,16 +843,9 @@ public function getError(?string $field = null): string
             $field = array_key_first($this->rules);
         }
 
-        $pattern = '/\A'
-            . str_replace(
-                ['\.\*', '\*\.'],
-                ['\.[^.]+', '[^.]+\.'],
-                preg_quote($field, '/')
-            )
-            . '\z/';
         $errors = array_filter(
             $this->getErrors(),
-            static fn ($key) => preg_match($pattern, $key),
+            static fn ($key) => preg_match($this->getRegex($field), $key),
             ARRAY_FILTER_USE_KEY
         );