diff --git a/app/Library/ZipStream.php b/app/Library/ZipStream.php
index f820d3e8..fbd34ed6 100644
--- a/app/Library/ZipStream.php
+++ b/app/Library/ZipStream.php
@@ -557,7 +557,7 @@ class ZipStream
      */
     public static function getRelativePath($path)
     {
-        $path = preg_replace("#/+\.?/+#", '/', str_replace('\\', '/', $path));
+        $path = preg_replace('#/+\\.?/+#', '/', str_replace('\\', '/', $path));
         $dirs = explode('/', rtrim(preg_replace('#^(?:\./)+#', '', $path), '/'));
 
         $offset = 0;
diff --git a/app/Library/getid3/demos/demo.mp3header.php b/app/Library/getid3/demos/demo.mp3header.php
index 8d39c927..7b97d9ac 100644
--- a/app/Library/getid3/demos/demo.mp3header.php
+++ b/app/Library/getid3/demos/demo.mp3header.php
@@ -1427,15 +1427,15 @@ if (! function_exists('IsValidURL')) {
         if ($parts = safe_parse_url($url)) {
             if (($parts['scheme'] != 'http') && ($parts['scheme'] != 'https') && ($parts['scheme'] != 'ftp') && ($parts['scheme'] != 'gopher')) {
                 return false;
-            } elseif (! preg_match("#^[[:alnum:]]([-.]?[0-9a-z])*\.[a-z]{2,3}#i$", $parts['host'], $regs) && ! preg_match('#^[0-9]{1,3}(\.[0-9]{1,3}){3}$#', $parts['host'])) {
+            } elseif (! preg_match('#^[[:alnum:]]([-.]?[0-9a-z])*\\.[a-z]{2,3}#i$', $parts['host'], $regs) && ! preg_match('#^[0-9]{1,3}(\.[0-9]{1,3}){3}$#', $parts['host'])) {
                 return false;
-            } elseif (! preg_match("#^([[:alnum:]-]|[\_])*$#i", $parts['user'], $regs)) {
+            } elseif (! preg_match('#^([[:alnum:]-]|[\\_])*$#i', $parts['user'], $regs)) {
                 return false;
-            } elseif (! preg_match("#^([[:alnum:]-]|[\_])*$#i", $parts['pass'], $regs)) {
+            } elseif (! preg_match('#^([[:alnum:]-]|[\\_])*$#i', $parts['pass'], $regs)) {
                 return false;
-            } elseif (! preg_match("#^[[:alnum:]/_\.@~-]*$#i", $parts['path'], $regs)) {
+            } elseif (! preg_match('#^[[:alnum:]/_\\.@~-]*$#i', $parts['path'], $regs)) {
                 return false;
-            } elseif (! preg_match("#^[[:alnum:]?&=+:;_()%#/,\.-]*$#i", $parts['query'], $regs)) {
+            } elseif (! preg_match('#^[[:alnum:]?&=+:;_()%#/,\\.-]*$#i', $parts['query'], $regs)) {
                 return false;
             } else {
                 return true;