diff --git a/bundle/bundle--mk.el b/bundle/bundle--mk.el
index f57340aa..a153c451 100644
--- a/bundle/bundle--mk.el
+++ b/bundle/bundle--mk.el
@@ -9,23 +9,24 @@
   "Locally mirror a website using `wget -mkEpnp <url>`")
 
 (defvar mk/useful-regex
-  '(("match any word or space that precede the :" . "[\w\s]+:")
-    ("search for anything in square brackets" . "\[.*\]")
-    ("[A-Za-z]+" "upper and lowercase english alphabet")
-    ("[0-9]" "numbers from 0 to 9")
-    ("[A-Za-z\-\.]" "upper and lowercase english alphabet, - and .")
-    ("(a-z)" "a, - and z")
-    ("(\s+|,)" "spaces or a comma")
-    ("#\w+" "find hashtags")
-    ("([@|#]\w+)" "matches both mentions (@) and hashtags")
-    ("(^[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+\.[a-zA-Z0-9-.]+$)" "email regex")
-    ("-?\d+(\.\d*)?" "matching decimal numbers")
-    ("(?:http|https|ftp|mailto|file|data|irc):\/\/[A-Za-z0-9\-]{0,63}(\.[A-Za-z0-9\-]{0,63})+(:\d{1,4})?\/*(\/*[A-Za-z0-9\-._]+\/*)*(\?.*)?(#.*)?" "matching urls")
-    ("^\d{4}/(0[1-9]|1[0-2])/(0[1-9]|[12][0-9]|3[01])$" "matching dates yyyy/mm/dd")
-    ("^(0[1-9]|1[0-2])/(0[1-9]|[12][0-9]|3[01])/\d{4}$" "matching dates mm/dd/yyyy")
-    ("^(0[1-9]|[12][0-9]|3[01])/(0[1-9]|1[0-2])/\d{4}$" "matching dates dd/mm/yyyy")
-    ("<.+>" "matching html")
-    ("<\/?(?:p|a|b|img)(?: \/)?>" "matchig specific tags")))
+  '(("match any word or space that precedes the :" . "[\\w\\s]+:")
+    ("search for anything in square brackets" . "\\[.*\\]")
+    ("upper and lowercase English alphabet" . "[A-Za-z]+")
+    ("numbers from 0 to 9" . "[0-9]")
+    ("upper and lowercase English alphabet, - and ." . "[A-Za-z\\-\\.]+")
+    ("a, - and z" . "(a-z)")
+    ("spaces or a comma" . "(\\s+|,)")
+    ("find hashtags" . "#\\w+")
+    ("matches both mentions (@) and hashtags" . "([@|#]\\w+)")
+    ("email regex" . "^[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+\\.[a-zA-Z0-9-.]+$")
+    ("matching decimal numbers" . "-?\\d+(\\.\\d*)?")
+    ("matching urls" . "(?:http|https|ftp|mailto|file|data|irc):\\/\\/[A-Za-z0-9\\-]{0,63}(\\.[A-Za-z0-9\\-]{0,63})+(:\\d{1,4})?\\/*(\\/*[A-Za-z0-9\\-._]+\\/*)*(\\?.*)?(#.*)?")
+    ("matching dates yyyy/mm/dd" . "^\\d{4}/(0[1-9]|1[0-2])/(0[1-9]|[12][0-9]|3[01])$")
+    ("matching dates mm/dd/yyyy" . "^(0[1-9]|1[0-2])/(0[1-9]|[12][0-9]|3[01])/\\d{4}$")
+    ("matching dates dd/mm/yyyy" . "^(0[1-9]|[12][0-9]|3[01])/(0[1-9]|1[0-2])/\\d{4}$")
+    ("matching HTML" . "<.+>")
+    ("matching specific tags" . "</?(?:p|a|b|img)(?: /)?>")
+	("ISO 8601 Date Format (YYYY-MM-DD)" . "\\([0-9]{4}\\)-\\([0-1][0-9]\\)-\\([0-3][0-9]\\)")))
 
 ;; (defun mk-show-modeline ()
 ;;   (interactive)