From 19201b87f7dba2a7cbf1cccdf0e1da13c04ee9c9 Mon Sep 17 00:00:00 2001
From: Kyle <kylekatarnls@users.noreply.github.com>
Date: Thu, 8 Nov 2018 14:33:47 +0100
Subject: [PATCH] Fix #1497 hasFormat more strict with full-year (#1499)

* Fix #1497 hasFormat more strict with full-year
---
 src/Carbon/Carbon.php            | 6 +++---
 tests/Carbon/IsTest.php          | 1 +
 tests/CarbonPeriod/AliasTest.php | 1 +
 3 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/Carbon/Carbon.php b/src/Carbon/Carbon.php
index f62dd45ec1..7f83dbf446 100644
--- a/src/Carbon/Carbon.php
+++ b/src/Carbon/Carbon.php
@@ -195,7 +195,7 @@ class Carbon extends DateTime implements JsonSerializable
         't' => '(2[89]|3[01])',
         'L' => '(0|1)',
         'o' => '([1-9][0-9]{0,4})',
-        'Y' => '([1-9][0-9]{0,4})',
+        'Y' => '([1-9]?[0-9]{4})',
         'y' => '([0-9]{2})',
         'a' => '(am|pm)',
         'A' => '(AM|PM)',
@@ -217,8 +217,8 @@ class Carbon extends DateTime implements JsonSerializable
         'U' => '([0-9]*)',
 
         // The formats below are combinations of the above formats.
-        'c' => '(([1-9][0-9]{0,4})\-(1[012]|0[1-9])\-(3[01]|[12][0-9]|0[1-9])T(2[0-3]|[01][0-9]):([0-5][0-9]):([0-5][0-9])[\+\-](1[012]|0[0-9]):([0134][05]))', // Y-m-dTH:i:sP
-        'r' => '(([a-zA-Z]{3}), ([123][0-9]|[1-9]) ([a-zA-Z]{3}) ([1-9][0-9]{0,4}) (2[0-3]|[01][0-9]):([0-5][0-9]):([0-5][0-9]) [\+\-](1[012]|0[0-9])([0134][05]))', // D, j M Y H:i:s O
+        'c' => '(([1-9]?[0-9]{4})\-(1[012]|0[1-9])\-(3[01]|[12][0-9]|0[1-9])T(2[0-3]|[01][0-9]):([0-5][0-9]):([0-5][0-9])[\+\-](1[012]|0[0-9]):([0134][05]))', // Y-m-dTH:i:sP
+        'r' => '(([a-zA-Z]{3}), ([123][0-9]|[1-9]) ([a-zA-Z]{3}) ([1-9]?[0-9]{4}) (2[0-3]|[01][0-9]):([0-5][0-9]):([0-5][0-9]) [\+\-](1[012]|0[0-9])([0134][05]))', // D, j M Y H:i:s O
     );
 
     /**
diff --git a/tests/Carbon/IsTest.php b/tests/Carbon/IsTest.php
index aaac189c51..691f305535 100644
--- a/tests/Carbon/IsTest.php
+++ b/tests/Carbon/IsTest.php
@@ -804,5 +804,6 @@ public function testHasFormat()
 
         // Regex failure
         $this->assertFalse(Carbon::hasFormat('1975-5-1', 'Y-m-d'));
+        $this->assertFalse(Carbon::hasFormat('19-05-01', 'Y-m-d'));
     }
 }
diff --git a/tests/CarbonPeriod/AliasTest.php b/tests/CarbonPeriod/AliasTest.php
index 5fb5a24bd6..2177b6457b 100644
--- a/tests/CarbonPeriod/AliasTest.php
+++ b/tests/CarbonPeriod/AliasTest.php
@@ -152,6 +152,7 @@ public function testModifyIntervalSingular()
 
     public function testChainAliases()
     {
+        Carbon::setTestNow('2018-05-15');
         $period = CarbonPeriod::days(3)->hours(5)->invert()
             ->sinceNow()->until(Carbon::now()->subDays(10))
             ->options(CarbonPeriod::EXCLUDE_START_DATE)