diff --git a/system/Validation/FormatRules.php b/system/Validation/FormatRules.php
index 57b211be5efe..cefe16469b5b 100644
--- a/system/Validation/FormatRules.php
+++ b/system/Validation/FormatRules.php
@@ -44,7 +44,8 @@ public function alpha_space(?string $value = null): bool
 			return true;
 		}
 
-		return (bool) preg_match('/^[A-Z ]+$/i', $value);
+		// @see https://regex101.com/r/LhqHPO/1
+		return (bool) preg_match('/\A[A-Z ]+\z/i', $value);
 	}
 
 	/**
@@ -56,7 +57,8 @@ public function alpha_space(?string $value = null): bool
 	 */
 	public function alpha_dash(?string $str = null): bool
 	{
-			return (bool) preg_match('/^[a-z0-9_-]+$/i', $str);
+		// @see https://regex101.com/r/XfVY3d/1
+		return (bool) preg_match('/\A[a-z0-9_-]+\z/i', $str);
 	}
 
 	/**
@@ -72,7 +74,8 @@ public function alpha_dash(?string $str = null): bool
 	 */
 	public function alpha_numeric_punct($str)
 	{
-		return (bool) preg_match('/^[A-Z0-9 ~!#$%\&\*\-_+=|:.]+$/i', $str);
+		// @see https://regex101.com/r/6N8dDY/1
+		return (bool) preg_match('/\A[A-Z0-9 ~!#$%\&\*\-_+=|:.]+\z/i', $str);
 	}
 
 	/**
@@ -96,7 +99,8 @@ public function alpha_numeric(?string $str = null): bool
 	 */
 	public function alpha_numeric_space(?string $str = null): bool
 	{
-		return (bool) preg_match('/^[A-Z0-9 ]+$/i', $str);
+		// @see https://regex101.com/r/0AZDME/1
+		return (bool) preg_match('/\A[A-Z0-9 ]+\z/i', $str);
 	}
 
 	/**
@@ -123,7 +127,8 @@ public function string($str = null): bool
 	 */
 	public function decimal(?string $str = null): bool
 	{
-		return (bool) preg_match('/^[-+]?[0-9]{0,}\.?[0-9]+$/', $str);
+		// @see https://regex101.com/r/HULifl/1/
+		return (bool) preg_match('/\A[-+]?[0-9]{0,}\.?[0-9]+\z/', $str);
 	}
 
 	/**
@@ -147,7 +152,7 @@ public function hex(?string $str = null): bool
 	 */
 	public function integer(?string $str = null): bool
 	{
-		return (bool) preg_match('/^[\-+]?[0-9]+$/', $str);
+		return (bool) preg_match('/\A[\-+]?[0-9]+\z/', $str);
 	}
 
 	/**
@@ -181,7 +186,8 @@ public function is_natural_no_zero(?string $str = null): bool
 	 */
 	public function numeric(?string $str = null): bool
 	{
-		return (bool) preg_match('/^[\-+]?[0-9]*\.?[0-9]+$/', $str);
+		// @see https://regex101.com/r/bb9wtr/1
+		return (bool) preg_match('/\A[\-+]?[0-9]*\.?[0-9]+\z/', $str);
 	}
 
 	/**
@@ -253,6 +259,7 @@ public function valid_json(string $str = null): bool
 	 */
 	public function valid_email(string $str = null): bool
 	{
+		// @see https://regex101.com/r/wlJG1t/1/
 		if (function_exists('idn_to_ascii') && defined('INTL_IDNA_VARIANT_UTS46') && preg_match('#\A([^@]+)@(.+)\z#', $str, $matches))
 		{
 			$str = $matches[1] . '@' . idn_to_ascii($matches[2], 0, INTL_IDNA_VARIANT_UTS46);
diff --git a/tests/system/Validation/FormatRulesTest.php b/tests/system/Validation/FormatRulesTest.php
index d7b171fe098a..56145c703201 100644
--- a/tests/system/Validation/FormatRulesTest.php
+++ b/tests/system/Validation/FormatRulesTest.php
@@ -424,6 +424,10 @@ public function alphaSpaceProvider()
 				FormatRulesTest::ALPHABET . ' ',
 				true,
 			],
+			[
+				FormatRulesTest::ALPHABET . "\n",
+				false,
+			],
 			[
 				FormatRulesTest::ALPHABET . '1',
 				false,
@@ -506,6 +510,10 @@ public function alphaNumericPunctProvider()
 				FormatRulesTest::ALPHANUMERIC . '`',
 				false,
 			],
+			[
+				FormatRulesTest::ALPHANUMERIC . "\n",
+				false,
+			],
 			[
 				FormatRulesTest::ALPHANUMERIC . '@',
 				false,
@@ -599,6 +607,10 @@ public function alphaNumericSpaceProvider()
 				' ' . FormatRulesTest::ALPHANUMERIC . '-',
 				false,
 			],
+			[
+				' ' . FormatRulesTest::ALPHANUMERIC . "\n",
+				false,
+			],
 			[
 				null,
 				false,
@@ -636,6 +648,10 @@ public function alphaDashProvider()
 				FormatRulesTest::ALPHANUMERIC . '-\ ',
 				false,
 			],
+			[
+				FormatRulesTest::ALPHANUMERIC . "-\n",
+				false,
+			],
 			[
 				null,
 				false,
@@ -722,6 +738,10 @@ public function numericProvider()
 				'+42',
 				true,
 			],
+			[
+				"+42\n",
+				false,
+			],
 			[
 				'123a',
 				false,
@@ -771,6 +791,10 @@ public function integerProvider()
 				'-1',
 				true,
 			],
+			[
+				"+42\n",
+				false,
+			],
 			[
 				'123a',
 				false,
@@ -824,6 +848,10 @@ public function decimalProvider()
 				'0',
 				true,
 			],
+			[
+				"0\n",
+				false,
+			],
 			[
 				'1.0a',
 				false,