Ticket #25108: 25108.diff

wp-includes/formatting.php

@@ -1855 +1855 @@
                 return apply_filters( 'is_email', false, $email, 'domain_no_periods' );
         }
 
+        $i = 0;
         // Loop through each sub
         foreach ( $subs as $sub ) {
                 // Test for leading and trailing hyphens and whitespace
@@ -1866 +1867 @@
                 if ( !preg_match('/^[a-z0-9-]+$/i', $sub ) ) {
                         return apply_filters( 'is_email', false, $email, 'sub_invalid_chars' );
                 }
+
+                // Test for fewer than 2 characters in last sub
+                if ( ++$i === count( $subs ) && strlen( $sub ) < 2 )
+                        return apply_filters( 'is_email', false, $email, 'last_sub_too_few_chars' );
         }
 
         // Congratulations your email made it!