diff --git a/src/HJSON/HJSONStringifier.php b/src/HJSON/HJSONStringifier.php
index 21001d3..fd9cae6 100644
--- a/src/HJSON/HJSONStringifier.php
+++ b/src/HJSON/HJSONStringifier.php
@@ -15,11 +15,11 @@ class HJSONStringifier
 {
 
     // needsEscape tests if the string can be written without escapes
-    private $needsEscape = '/[\\\"\x00-\x1f\x7f-\x9f\x{00ad}\x{0600}-\x{0604}\x{070f}\x{17b4}\x{17b5}\x{200c}-\x{200f}\x{2028}-\x{202f}\x{2060}-\x{206f}\x{feff}\x{fff0}-\x{ffff}\x]/u';
+    private $needsEscape = '/[\\\"\x00-\x1f\x7f-\x9f\x{00ad}\x{0600}-\x{0604}\x{070f}\x{17b4}\x{17b5}\x{200c}-\x{200f}\x{2028}-\x{202f}\x{2060}-\x{206f}\x{feff}\x{fff0}-\x{ffff}]/u';
     // needsQuotes tests if the string can be written as a quoteless string (includes needsEscape but without \\ and \")
-    private $needsQuotes = '/^\\s|^"|^\'|^\'\'\'|^#|^\\/\\*|^\\/\\/|^\\{|^\\}|^\\[|^\\]|^:|^,|\\s$|[\x00-\x1f\x7f-\x9f\x{00ad}\x{0600}-\x{0604}\x{070f}\x{17b4}\x{17b5}\x{200c}-\x{200f}\x{2028}-\x{202f}\x{2060}-\x{206f}\x{feff}\x{fff0}-\x{ffff}\x]/u';
+    private $needsQuotes = '/^\\s|^"|^\'|^\'\'\'|^#|^\\/\\*|^\\/\\/|^\\{|^\\}|^\\[|^\\]|^:|^,|\\s$|[\x00-\x1f\x7f-\x9f\x{00ad}\x{0600}-\x{0604}\x{070f}\x{17b4}\x{17b5}\x{200c}-\x{200f}\x{2028}-\x{202f}\x{2060}-\x{206f}\x{feff}\x{fff0}-\x{ffff}]/u';
     // needsEscapeML tests if the string can be written as a multiline string (includes needsEscape but without \n, \r, \\ and \")
-    private $needsEscapeML = '/^\\s+$|\'\'\'|[\x00-\x08\x0b\x0c\x0e-\x1f\x7f-\x9f\x{00ad}\x{0600}-\x{0604}\x{070f}\x{17b4}\x{17b5}\x{200c}-\x{200f}\x{2028}-\x{202f}\x{2060}-\x{206f}\x{feff}\x{fff0}-\x{ffff}\x]/u';
+    private $needsEscapeML = '/^\\s+$|\'\'\'|[\x00-\x08\x0b\x0c\x0e-\x1f\x7f-\x9f\x{00ad}\x{0600}-\x{0604}\x{070f}\x{17b4}\x{17b5}\x{200c}-\x{200f}\x{2028}-\x{202f}\x{2060}-\x{206f}\x{feff}\x{fff0}-\x{ffff}]/u';
     private $startsWithKeyword = '/^(true|false|null)\s*((,|\]|\}|#|\/\/|\/\*).*)?$/';
     private $needsEscapeName = '/[,\{\[\}\]\s:#"\']|\/\/|\/\*|\'\'\'/';
     private $gap = '';