Disallow 5-digits years in hasFormat()

Fix #2831

readme.md

@@ -124,7 +124,7 @@ Support this project by becoming a sponsor. Your logo will show up here with a l
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src/Carbon/Traits/Options.php

@@ -80,9 +80,9 @@ trait Options
         'n' => '(1[012]|[1-9])',
         't' => '(2[89]|3[01])',
         'L' => '(0|1)',
-        'o' => '([1-9][0-9]{0,4})',
-        'Y' => '([1-9]?[0-9]{4})',
-        'y' => '([0-9]{2})',
+        'o' => '([0-9]{1,4})',
+        'Y' => '([0-9]{1,4})',
+        'y' => '([0-9]{1,2})',
         'a' => '(am|pm)',
         'A' => '(AM|PM)',
         'B' => '([0-9]{3})',