diff --git a/etc/ORG-NEWS b/etc/ORG-NEWS
index 1111a92c6..7542d9718 100644
--- a/etc/ORG-NEWS
+++ b/etc/ORG-NEWS
@@ -252,6 +252,9 @@ You can turn this on/off on a per-file basis with =#+startup: num= or
 Functions in this hook are run after ~org-agenda-filter~ is called.
 
 ** Removed or renamed functions and variables
+*** Removed  ~org-maybe-keyword-time-regexp~
+
+The variable was not used in the code base.
 
 *** Renamed ~org-columns-set-tags-or-toggle~
 
diff --git a/lisp/org.el b/lisp/org.el
index 32fe7418f..8b8874496 100644
--- a/lisp/org.el
+++ b/lisp/org.el
@@ -369,6 +369,65 @@ FULL is given."
 (defconst org-dblock-end-re "^[ \t]*#\\+\\(?:END\\|end\\)\\([: \t\r\n]\\|$\\)"
   "Matches the end of a dynamic block.")
 
+;;;; Timestamp
+
+(defconst org-ts--internal-regexp
+  (rx (seq
+       (= 4 digit) "-" (= 2 digit) "-" (= 2 digit)
+       (optional " " (*? nonl))))
+  "Regular expression matching the innards of a time stamp.")
+
+(defconst org-ts-regexp (format "<\\(%s\\)>" org-ts--internal-regexp)
+  "Regular expression for fast time stamp matching.")
+
+(defconst org-ts-regexp-inactive
+  (format "\\[\\(%s\\)\\]" org-ts--internal-regexp)
+  "Regular expression for fast inactive time stamp matching.")
+
+(defconst org-ts-regexp-both (format "[[<]\\(%s\\)[]>]" org-ts--internal-regexp)
+  "Regular expression for fast time stamp matching.")
+
+(defconst org-ts-regexp0
+  "\\(\\([0-9]\\{4\\}\\)-\\([0-9]\\{2\\}\\)-\\([0-9]\\{2\\}\\)\\( +[^]+0-9>\r\n -]+\\)?\\( +\\([0-9]\\{1,2\\}\\):\\([0-9]\\{2\\}\\)\\)?\\)"
+  "Regular expression matching time strings for analysis.
+This one does not require the space after the date, so it can be used
+on a string that terminates immediately after the date.")
+
+(defconst org-ts-regexp1 "\\(\\([0-9]\\{4\\}\\)-\\([0-9]\\{2\\}\\)-\\([0-9]\\{2\\}\\) *\\([^]+0-9>\r\n -]*\\)\\( \\([0-9]\\{1,2\\}\\):\\([0-9]\\{2\\}\\)\\)?\\)"
+  "Regular expression matching time strings for analysis.")
+
+(defconst org-ts-regexp2 (concat "<" org-ts-regexp1 "[^>\n]\\{0,16\\}>")
+  "Regular expression matching time stamps, with groups.")
+
+(defconst org-ts-regexp3 (concat "[[<]" org-ts-regexp1 "[^]>\n]\\{0,16\\}[]>]")
+  "Regular expression matching time stamps (also [..]), with groups.")
+
+(defconst org-tr-regexp (concat org-ts-regexp "--?-?" org-ts-regexp)
+  "Regular expression matching a time stamp range.")
+
+(defconst org-tr-regexp-both
+  (concat org-ts-regexp-both "--?-?" org-ts-regexp-both)
+  "Regular expression matching a time stamp range.")
+
+(defconst org-tsr-regexp (concat org-ts-regexp "\\(--?-?"
+				 org-ts-regexp "\\)?")
+  "Regular expression matching a time stamp or time stamp range.")
+
+(defconst org-tsr-regexp-both
+  (concat org-ts-regexp-both "\\(--?-?"
+	  org-ts-regexp-both "\\)?")
+  "Regular expression matching a time stamp or time stamp range.
+The time stamps may be either active or inactive.")
+
+(defconst org-repeat-re
+  "<[0-9]\\{4\\}-[0-9][0-9]-[0-9][0-9] [^>\n]*?\
+\\([.+]?\\+[0-9]+[hdwmy]\\(/[0-9]+[hdwmy]\\)?\\)"
+  "Regular expression for specifying repeated events.
+After a match, group 1 contains the repeat expression.")
+
+(defconst org-time-stamp-formats '("<%Y-%m-%d %a>" . "<%Y-%m-%d %a %H:%M>")
+  "Formats for `format-time-string' which are used for time stamps.")
+
 ;;;; Clock and Planning
 
 (defconst org-clock-string "CLOCK:"
@@ -460,18 +519,6 @@ Matched keyword is in group 1.")
    " *[[<]\\([^]>]+\\)[]>]")
   "Matches any of the 3 keywords, together with the time stamp.")
 
-(defconst org-maybe-keyword-time-regexp
-  (concat "\\(\\<"
-	  (regexp-opt
-	   (list org-scheduled-string org-deadline-string org-closed-string
-		 org-clock-string)
-	   t)
-	  "\\)?"
-	  " *\\([[<][0-9]\\{4\\}-[0-9]\\{2\\}-[0-9]\\{2\\} ?[^]\r\n>]*?[]>]"
-	  "\\|"
-	  "<%%([^\r\n>]*>\\)")
-  "Matches a timestamp, possibly preceded by a keyword.")
-
 (defconst org-all-time-keywords
   (mapcar (lambda (w) (substring w 0 -1))
 	  (list org-scheduled-string org-deadline-string
@@ -497,9 +544,9 @@ Group 1 contains drawer's name or \"END\".")
   "Regular expression matching the last line of a clock drawer.")
 
 (defconst org-logbook-drawer-re
-  (concat "^[ \t]*:LOGBOOK:[ \t]*\n"
-	  "\\(?:[ \t]*.*\\(?: .*\\)?[ \t]*\n\\)*?"
-	  "[ \t]*:END:[ \t]*$")
+  (rx (seq bol (0+ (any "\t ")) ":LOGBOOK:" (0+ (any "\t ")) "\n"
+	   (*? (0+ nonl) "\n")
+	   (0+ (any "\t ")) ":END:" (0+ (any "\t ")) eol))
   "Matches an entire LOGBOOK drawer.")
 
 (defconst org-property-drawer-re
@@ -576,59 +623,6 @@ An entry can be toggled between COMMENT and normal with
 Effort estimates given in this property need to be in the format
 defined in org-duration.el.")
 
-;;;; Timestamp
-
-(defconst org-ts-regexp "<\\([0-9]\\{4\\}-[0-9]\\{2\\}-[0-9]\\{2\\} ?[^\r\n>]*?\\)>"
-  "Regular expression for fast time stamp matching.")
-
-(defconst org-ts-regexp-inactive
-  "\\[\\([0-9]\\{4\\}-[0-9]\\{2\\}-[0-9]\\{2\\} ?[^\r\n>]*?\\)\\]"
-  "Regular expression for fast inactive time stamp matching.")
-
-(defconst org-ts-regexp-both "[[<]\\([0-9]\\{4\\}-[0-9]\\{2\\}-[0-9]\\{2\\} ?[^]\r\n>]*?\\)[]>]"
-  "Regular expression for fast time stamp matching.")
-
-(defconst org-ts-regexp0
-  "\\(\\([0-9]\\{4\\}\\)-\\([0-9]\\{2\\}\\)-\\([0-9]\\{2\\}\\)\\( +[^]+0-9>\r\n -]+\\)?\\( +\\([0-9]\\{1,2\\}\\):\\([0-9]\\{2\\}\\)\\)?\\)"
-  "Regular expression matching time strings for analysis.
-This one does not require the space after the date, so it can be used
-on a string that terminates immediately after the date.")
-
-(defconst org-ts-regexp1 "\\(\\([0-9]\\{4\\}\\)-\\([0-9]\\{2\\}\\)-\\([0-9]\\{2\\}\\) *\\([^]+0-9>\r\n -]*\\)\\( \\([0-9]\\{1,2\\}\\):\\([0-9]\\{2\\}\\)\\)?\\)"
-  "Regular expression matching time strings for analysis.")
-
-(defconst org-ts-regexp2 (concat "<" org-ts-regexp1 "[^>\n]\\{0,16\\}>")
-  "Regular expression matching time stamps, with groups.")
-
-(defconst org-ts-regexp3 (concat "[[<]" org-ts-regexp1 "[^]>\n]\\{0,16\\}[]>]")
-  "Regular expression matching time stamps (also [..]), with groups.")
-
-(defconst org-tr-regexp (concat org-ts-regexp "--?-?" org-ts-regexp)
-  "Regular expression matching a time stamp range.")
-
-(defconst org-tr-regexp-both
-  (concat org-ts-regexp-both "--?-?" org-ts-regexp-both)
-  "Regular expression matching a time stamp range.")
-
-(defconst org-tsr-regexp (concat org-ts-regexp "\\(--?-?"
-				 org-ts-regexp "\\)?")
-  "Regular expression matching a time stamp or time stamp range.")
-
-(defconst org-tsr-regexp-both
-  (concat org-ts-regexp-both "\\(--?-?"
-	  org-ts-regexp-both "\\)?")
-  "Regular expression matching a time stamp or time stamp range.
-The time stamps may be either active or inactive.")
-
-(defconst org-repeat-re
-  "<[0-9]\\{4\\}-[0-9][0-9]-[0-9][0-9] [^>\n]*?\
-\\([.+]?\\+[0-9]+[hdwmy]\\(/[0-9]+[hdwmy]\\)?\\)"
-  "Regular expression for specifying repeated events.
-After a match, group 1 contains the repeat expression.")
-
-(defconst org-time-stamp-formats '("<%Y-%m-%d %a>" . "<%Y-%m-%d %a %H:%M>")
-  "Formats for `format-time-string' which are used for time stamps.")
-
 
 ;;; The custom variables