diff --git a/readme.md b/readme.md
index 057327a5c7..1342b00b4d 100644
--- a/readme.md
+++ b/readme.md
@@ -124,7 +124,7 @@ Support this project by becoming a sponsor. Your logo will show up here with a l
-
+
diff --git a/src/Carbon/Traits/Options.php b/src/Carbon/Traits/Options.php
index 6f021942ac..314c95e9f8 100644
--- a/src/Carbon/Traits/Options.php
+++ b/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})',