diff --git a/WordPress-Core/ruleset.xml b/WordPress-Core/ruleset.xml
index b4e973a70f..2835d85cb4 100644
--- a/WordPress-Core/ruleset.xml
+++ b/WordPress-Core/ruleset.xml
@@ -116,7 +116,8 @@
 	<rule ref="WordPress.Functions.DontExtract"/>
 	<rule ref="WordPress.NamingConventions.ValidHookName"/>
 	<rule ref="WordPress.DB.RestrictedFunctions"/>
-
 	<rule ref="WordPress.DB.RestrictedClasses"/>
 
+	<rule ref="WordPress.PHP.POSIXFunctions" />
+
 </ruleset>
diff --git a/WordPress/Sniffs/PHP/DiscouragedFunctionsSniff.php b/WordPress/Sniffs/PHP/DiscouragedFunctionsSniff.php
index 806247a124..34068bd57e 100644
--- a/WordPress/Sniffs/PHP/DiscouragedFunctionsSniff.php
+++ b/WordPress/Sniffs/PHP/DiscouragedFunctionsSniff.php
@@ -31,13 +31,6 @@ class WordPress_Sniffs_PHP_DiscouragedFunctionsSniff extends Generic_Sniffs_PHP_
 	 * @var array(string => string|null)
 	 */
 	public $forbiddenFunctions = array(
-		// Deprecated.
-		'ereg_replace'             => 'preg_replace',
-		'ereg'                     => null,
-		'eregi_replace'            => 'preg_replace',
-		'split'                    => null,
-		'spliti'                   => null,
-
 		// Development.
 		'print_r'                  => null,
 		'debug_print_backtrace'    => null,
diff --git a/WordPress/Sniffs/PHP/POSIXFunctionsSniff.php b/WordPress/Sniffs/PHP/POSIXFunctionsSniff.php
new file mode 100644
index 0000000000..2ab56a9a99
--- /dev/null
+++ b/WordPress/Sniffs/PHP/POSIXFunctionsSniff.php
@@ -0,0 +1,69 @@
+<?php
+/**
+ * WordPress Coding Standard.
+ *
+ * @category PHP
+ * @package  PHP_CodeSniffer
+ * @link     https://make.wordpress.org/core/handbook/best-practices/coding-standards/
+ */
+
+/**
+ * Perl compatible regular expressions (PCRE, preg_ functions) should be used in preference
+ * to their POSIX counterparts.
+ *
+ * @link     https://make.wordpress.org/core/handbook/best-practices/coding-standards/php/#regular-expressions
+ * @link     http://php.net/manual/en/ref.regex.php
+ *
+ * @category PHP
+ * @package  PHP_CodeSniffer
+ * @author   Juliette Reinders Folmer <wpplugins_nospam@adviesenzo.nl>
+ */
+class WordPress_Sniffs_PHP_POSIXFunctionsSniff extends WordPress_AbstractFunctionRestrictionsSniff {
+
+	/**
+	 * Groups of functions to restrict.
+	 *
+	 * Example: groups => array(
+	 * 	'lambda' => array(
+	 * 		'type'      => 'error' | 'warning',
+	 * 		'message'   => 'Use anonymous functions instead please!',
+	 * 		'functions' => array( 'eval', 'create_function' ),
+	 * 	)
+	 * )
+	 *
+	 * @return array
+	 */
+	public function getGroups() {
+		return array(
+			'ereg' => array(
+				'type'      => 'error',
+				'message'   => '%s has been deprecated since PHP 5.3 and removed in PHP 7.0, please use preg_match() instead.',
+				'functions' => array(
+					'ereg',
+					'eregi',
+					'sql_regcase',
+				),
+			),
+
+			'ereg_replace' => array(
+				'type'      => 'error',
+				'message'   => '%s has been deprecated since PHP 5.3 and removed in PHP 7.0, please use preg_replace() instead.',
+				'functions' => array(
+					'ereg_replace',
+					'eregi_replace',
+				),
+			),
+
+			'split' => array(
+				'type'      => 'error',
+				'message'   => '%s  has been deprecated since PHP 5.3 and removed in PHP 7.0, please use explode(), str_split() or preg_split() instead.',
+				'functions' => array(
+					'split',
+					'spliti',
+				),
+			),
+
+		);
+	} // end getGroups()
+
+} // end class
diff --git a/WordPress/Sniffs/VIP/RestrictedFunctionsSniff.php b/WordPress/Sniffs/VIP/RestrictedFunctionsSniff.php
index 72111b816a..50ccb710ec 100644
--- a/WordPress/Sniffs/VIP/RestrictedFunctionsSniff.php
+++ b/WordPress/Sniffs/VIP/RestrictedFunctionsSniff.php
@@ -285,38 +285,6 @@ public function getGroups() {
 				),
 			),
 
-			'ereg' => array(
-				'type'      => 'error',
-				'message'   => '%s is prohibited, please use preg_match() instead. See http://php.net/manual/en/function.ereg.php',
-				'functions' => array(
-					'ereg',
-				),
-			),
-
-			'eregi' => array(
-				'type'      => 'error',
-				'message'   => '%s is prohibited, please use preg_match() with i modifier instead. See http://php.net/manual/en/function.eregi.php',
-				'functions' => array(
-					'eregi',
-				),
-			),
-
-			'ereg_replace' => array(
-				'type'      => 'error',
-				'message'   => '%s is prohibited, please use preg_replace() instead. See http://php.net/manual/en/function.ereg-replace.php',
-				'functions' => array(
-					'ereg_replace',
-				),
-			),
-
-			'split' => array(
-				'type'      => 'error',
-				'message'   => '%s is prohibited, please use explode() or preg_split() instead. See http://php.net/manual/en/function.split.php',
-				'functions' => array(
-					'split',
-				),
-			),
-
 			'runtime_configuration' => array(
 				'type'      => 'error',
 				'message'   => '%s is prohibited, changing configuration at runtime is not allowed on VIP Production.',
diff --git a/WordPress/Tests/PHP/DiscouragedFunctionsUnitTest.inc b/WordPress/Tests/PHP/DiscouragedFunctionsUnitTest.inc
index 2852bfcd72..0c1733e3b7 100644
--- a/WordPress/Tests/PHP/DiscouragedFunctionsUnitTest.inc
+++ b/WordPress/Tests/PHP/DiscouragedFunctionsUnitTest.inc
@@ -9,24 +9,6 @@ var_dump( $post_id ); // Bad, forbidden use
 print_r( $post_ID ); // Bad, forbidden use
 
 
-// DEPRECATED PHP FUNCTIONS
-// ------------------------
-
-$title = get_the_title();
-
-$title = ereg_replace( 'cool', 'not cool', get_the_title() ); // Bad, ereg_replace has been deprecated. Use preg_replace instead.
-$title = preg_replace( 'cool', 'not cool', get_the_title() ); // Good
-
-if ( ereg( '[A-Za-z]+', $title, $regs ) ) // Bad, ereg also deprecated. Use preg_match instead.
-	die( $regs );
-
-$title = eregi_replace( 'cool', 'not cool', get_the_title() ); // Bad, eregi_replace also deprecated. Use preg_replace instead.
-
-list( $year, $month, $day ) = split( ':', $date ); // Bad, split has been deprecated. Use preg_split or explode instead.
-
-$title_parts = spliti( ' ', get_the_title(), 4 ); // Bad, spliti also deprecated. Use preg_split instead.
-
-
 // DEPRECATED WORDPRESS FUNCTIONS
 // ------------------------------
 
diff --git a/WordPress/Tests/PHP/DiscouragedFunctionsUnitTest.php b/WordPress/Tests/PHP/DiscouragedFunctionsUnitTest.php
index 4ef3e1e383..e59a7cc11e 100644
--- a/WordPress/Tests/PHP/DiscouragedFunctionsUnitTest.php
+++ b/WordPress/Tests/PHP/DiscouragedFunctionsUnitTest.php
@@ -49,28 +49,23 @@ public function getWarningList() {
 		return array(
 			8 => 1,
 			9 => 1,
+			15 => 1,
 			17 => 1,
-			20 => 1,
+			19 => 1,
+			21 => 1,
 			23 => 1,
 			25 => 1,
 			27 => 1,
+			29 => 1,
+			31 => 1,
 			33 => 1,
 			35 => 1,
 			37 => 1,
 			39 => 1,
-			41 => 1,
-			43 => 1,
 			45 => 1,
 			47 => 1,
-			49 => 1,
-			51 => 1,
-			53 => 1,
-			55 => 1,
-			57 => 1,
-			63 => 1,
-			65 => 1,
-			70 => 1,
-			72 => 1,
+			52 => 1,
+			54 => 1,
 		);
 
 	} // end getWarningList()
diff --git a/WordPress/Tests/PHP/POSIXFunctionsUnitTest.inc b/WordPress/Tests/PHP/POSIXFunctionsUnitTest.inc
new file mode 100644
index 0000000000..bad1dd5372
--- /dev/null
+++ b/WordPress/Tests/PHP/POSIXFunctionsUnitTest.inc
@@ -0,0 +1,26 @@
+<?php
+
+// These are ok.
+$regex = preg_quote( 'cool', '#' ); // Good
+$title = preg_match( 'cool', get_the_title() ); // Good
+$title = preg_match_all( 'cool', get_the_title(), $matches ); // Good
+$title = preg_replace( 'cool', 'not cool', get_the_title() ); // Good
+$title = preg_replace_callback( 'cool', 'callback_function', get_the_title() ); // Good
+$title = preg_split( 'cool', get_the_title() ); // Good
+
+
+// These should all trigger an error.
+if ( ereg( '[A-Za-z]+', $title, $regs ) ) // Bad, ereg deprecated. Use preg_match instead.
+	die( $regs );
+
+if ( eregi( '[a-z]+', $title, $regs ) ) {} // Bad, eregi deprecated. Use preg_match instead.
+
+$title = ereg_replace( 'cool', 'not cool', get_the_title() ); // Bad, ereg_replace has been deprecated. Use preg_replace instead.
+
+$title = eregi_replace( 'cool', 'not cool', get_the_title() ); // Bad, eregi_replace also deprecated. Use preg_replace instead.
+
+list( $year, $month, $day ) = split( ':', $date ); // Bad, split has been deprecated. Use preg_split or explode instead.
+
+$title_parts = spliti( ' ', get_the_title(), 4 ); // Bad, spliti also deprecated. Use preg_split instead.
+
+sql_regcase( 'Foo - bar.'); // Bad. Deprecated.
diff --git a/WordPress/Tests/PHP/POSIXFunctionsUnitTest.php b/WordPress/Tests/PHP/POSIXFunctionsUnitTest.php
new file mode 100644
index 0000000000..5fed70b1c0
--- /dev/null
+++ b/WordPress/Tests/PHP/POSIXFunctionsUnitTest.php
@@ -0,0 +1,61 @@
+<?php
+/**
+ * Unit test class for WordPress Coding Standard.
+ *
+ * @category PHP
+ * @package  PHP_CodeSniffer
+ * @link     https://make.wordpress.org/core/handbook/best-practices/coding-standards/
+ */
+
+/**
+ * WordPress_Tests_PHP_POSIXFunctionsUnitTest
+ *
+ * A sniff unit test checks a .inc file for expected violations of a single
+ * coding standard. Expected errors and warnings are stored in this class.
+ *
+ * @category  PHP
+ * @package   PHP_CodeSniffer
+ * @author    Akeda Bagus <akeda@x-team.com>
+ * @author    Greg Sherwood <gsherwood@squiz.net>
+ * @author    Marc McIntyre <mmcintyre@squiz.net>
+ * @license   https://github.com/squizlabs/PHP_CodeSniffer/blob/master/licence.txt BSD Licence
+ * @version   Release: @package_version@
+ * @link      http://pear.php.net/package/PHP_CodeSniffer
+ */
+class WordPress_Tests_PHP_POSIXFunctionsUnitTest extends AbstractSniffUnitTest {
+
+	/**
+	 * Returns the lines where errors should occur.
+	 *
+	 * The key of the array should represent the line number and the value
+	 * should represent the number of errors that should occur on that line.
+	 *
+	 * @return array(int => int)
+	 */
+	public function getErrorList() {
+		return array(
+			13 => 1,
+			16 => 1,
+			18 => 1,
+			20 => 1,
+			22 => 1,
+			24 => 1,
+			26 => 1,
+		);
+
+	} // end getErrorList()
+
+	/**
+	 * Returns the lines where warnings should occur.
+	 *
+	 * The key of the array should represent the line number and the value
+	 * should represent the number of warnings that should occur on that line.
+	 *
+	 * @return array(int => int)
+	 */
+	public function getWarningList() {
+		return array();
+
+	} // end getWarningList()
+
+} // end class