Fixes rakit/validation#139

Author: gdarko

src/Validation.php

@@ -529,7 +529,8 @@ protected function parseRule(string $rule): array
         $exp = explode(':', $rule, 2);
         $rulename = $exp[0];
         if ($rulename !== 'regex') {
-            $params = isset($exp[1])? explode(',', $exp[1]) : [];
+            $params = isset($exp[1]) ?
+                str_replace("\,", ",", preg_split('~(?<!\\\)' . preg_quote(",", '~') . '~', $exp[1])) : [];
         } else {
             $params = [$exp[1]];
         }

tests/ValidationTest.php

@@ -68,6 +68,13 @@ public function parseRuleProvider()
                     ['/^([a-zA-Z\,]*)$/'],
                 ],
             ],
+            [
+                "in:a,b\,c,d\,e",
+                [
+                    'in',
+                    ['a','b,c','d,e']
+                ]
+            ]
         ];
     }
 }