diff --git a/contrib/lisp/org-contacts.el b/contrib/lisp/org-contacts.el
index 72269de7e..309b9b963 100644
--- a/contrib/lisp/org-contacts.el
+++ b/contrib/lisp/org-contacts.el
@@ -317,16 +317,16 @@ cell corresponding to the contact properties.
     (cl-loop for contact in (org-contacts-db)
 	     if (or
 		 (and name-match
-		      (org-string-match-p name-match
+		      (string-match-p name-match
 					  (first contact)))
 		 (and prop-match
 		      (cl-find-if (lambda (prop)
 				     (and (string= (car prop-match) (car prop))
-					  (org-string-match-p (cdr prop-match) (cdr prop))))
+					  (string-match-p (cdr prop-match) (cdr prop))))
 				   (caddr contact)))
 		 (and tags-match
 		      (cl-find-if (lambda (tag)
-				     (org-string-match-p tags-match tag))
+				     (string-match-p tags-match tag))
 				   (org-split-string
 				    (or (cdr (assoc-string "ALLTAGS" (caddr contact))) "") ":"))))
 	     collect contact)))
@@ -505,7 +505,7 @@ prefixes rather than just the beginning of the string."
 
 A group FOO is composed of contacts with the tag FOO."
   (let* ((completion-ignore-case org-contacts-completion-ignore-case)
-	 (group-completion-p (org-string-match-p
+	 (group-completion-p (string-match-p
 			      (concat "^" org-contacts-group-prefix) string)))
     (when group-completion-p
       (let ((completion-list
@@ -554,7 +554,7 @@ with BAR.
 See (org) Matching tags and properties for a complete
 description."
   (let* ((completion-ignore-case org-contacts-completion-ignore-case)
-	 (completion-p (org-string-match-p
+	 (completion-p (string-match-p
 			(concat "^" org-contacts-tags-props-prefix) string)))
     (when completion-p
       (let ((result
diff --git a/contrib/lisp/org-wl.el b/contrib/lisp/org-wl.el
index 00bbf3253..befbc168c 100644
--- a/contrib/lisp/org-wl.el
+++ b/contrib/lisp/org-wl.el
@@ -291,7 +291,7 @@ for namazu index."
 	  ;; in the old buffer.
 	  (goto-char old-point))
 	(when article
-	  (if (org-string-match-p "@" article)
+	  (if (string-match-p "@" article)
 	      (wl-summary-jump-to-msg-by-message-id (org-add-angle-brackets
 						     article))
 	    (or (wl-summary-jump-to-msg (string-to-number article))
diff --git a/contrib/lisp/ox-bibtex.el b/contrib/lisp/ox-bibtex.el
index 4bf0a4b91..56dec3837 100644
--- a/contrib/lisp/ox-bibtex.el
+++ b/contrib/lisp/ox-bibtex.el
@@ -303,7 +303,7 @@ the HTML and ASCII backends."
 		  next)
 	      (while (and (setq next (org-export-get-next-element object info))
 			  (or (and (stringp next)
-				   (not (org-string-match-p "\\S-" next)))
+				   (not (string-match-p "\\S-" next)))
 			      (org-bibtex-citation-p next)))
 		(unless (stringp next)
 		  (push (org-bibtex-get-citation-key next) keys))
diff --git a/lisp/ob-core.el b/lisp/ob-core.el
index 8bc07dd85..6e4362a3c 100644
--- a/lisp/ob-core.el
+++ b/lisp/ob-core.el
@@ -1801,7 +1801,7 @@ region is not active then the point is demarcated."
 	 (stars (concat (make-string (or (org-current-level) 1) ?*) " "))
 	 (lower-case-p (and block
 			    (let (case-fold-search)
-			      (org-string-match-p "#\\+begin_src" block)))))
+			      (string-match-p "#\\+begin_src" block)))))
     (if info
         (mapc
          (lambda (place)
diff --git a/lisp/ob-processing.el b/lisp/ob-processing.el
index dfc4693e8..5a4596313 100644
--- a/lisp/ob-processing.el
+++ b/lisp/ob-processing.el
@@ -96,7 +96,7 @@
 			(progn
 			  (setq sketch-dir-candidate
 				(make-temp-file "processing" t))
-			  (when (org-string-match-p
+			  (when (string-match-p
 				 "-"
 				 (file-name-nondirectory sketch-dir-candidate))
 			    (delete-directory sketch-dir-candidate)
diff --git a/lisp/ob-stan.el b/lisp/ob-stan.el
index 5faa8fc25..bf4e394df 100644
--- a/lisp/ob-stan.el
+++ b/lisp/ob-stan.el
@@ -69,7 +69,7 @@ Otherwise, write the Stan code directly to the named file."
 	       (or (cdr (assq :file params))
 		   (user-error "Set :file argument to execute Stan blocks")))))
     (if (or (not org-babel-stan-cmdstan-directory)
-	    (org-string-match-p "\\.stan\\'" file))
+	    (string-match-p "\\.stan\\'" file))
 	(with-temp-file file (insert body))
       (with-temp-file (concat file ".stan") (insert body))
       (let ((default-directory org-babel-stan-cmdstan-directory))
diff --git a/lisp/org-agenda.el b/lisp/org-agenda.el
index b47f8b6cb..298042bad 100644
--- a/lisp/org-agenda.el
+++ b/lisp/org-agenda.el
@@ -6441,7 +6441,7 @@ The flag is set if the currently compiled format contains a `%b'.")
 (defun org-agenda-get-category-icon (category)
   "Return an image for CATEGORY according to `org-agenda-category-icon-alist'."
   (dolist (entry org-agenda-category-icon-alist)
-    (when (org-string-match-p (car entry) category)
+    (when (string-match-p (car entry) category)
       (if (listp (cadr entry))
 	  (return (cadr entry))
 	(return (apply 'create-image (cdr entry)))))))
diff --git a/lisp/org-clock.el b/lisp/org-clock.el
index 53dc0a214..03e6a2cc2 100644
--- a/lisp/org-clock.el
+++ b/lisp/org-clock.el
@@ -87,7 +87,7 @@ Return value is either a string, an integer, or nil."
     (cond ((equal p "nil") nil)
 	  ((equal p "t") (or (org-log-into-drawer) "LOGBOOK"))
           ((org-string-nw-p p)
-	   (if (org-string-match-p "\\`[0-9]+\\'" p) (string-to-number p) p))
+	   (if (string-match-p "\\`[0-9]+\\'" p) (string-to-number p) p))
 	  ((org-string-nw-p org-clock-into-drawer))
 	  ((integerp org-clock-into-drawer) org-clock-into-drawer)
 	  ((not org-clock-into-drawer) nil)
diff --git a/lisp/org-element.el b/lisp/org-element.el
index 4079a5fcb..a4a2cc32c 100644
--- a/lisp/org-element.el
+++ b/lisp/org-element.el
@@ -3116,8 +3116,8 @@ Assume point is at the beginning of the link."
 	 ((string-match "\\`id:\\([-a-f0-9]+\\)\\'" raw-link)
 	  (setq type "id" path (match-string 1 raw-link)))
 	 ;; Code-ref type: PATH is the name of the reference.
-	 ((and (org-string-match-p "\\`(" raw-link)
-	       (org-string-match-p ")\\'" raw-link))
+	 ((and (string-match-p "\\`(" raw-link)
+	       (string-match-p ")\\'" raw-link))
 	  (setq type "coderef")
 	  (setq path (substring raw-link 1 -1)))
 	 ;; Custom-id type: PATH is the name of the custom id.
diff --git a/lisp/org-lint.el b/lisp/org-lint.el
index 444ab8032..ca69e9d1b 100644
--- a/lisp/org-lint.el
+++ b/lisp/org-lint.el
@@ -363,7 +363,7 @@ called with one argument, the key used for comparison."
       (lambda (k)
 	(let ((key (org-element-property :key k)))
 	  (and (or (let ((case-fold-search t))
-		     (org-string-match-p "\\`ATTR_[-_A-Za-z0-9]+\\'" key))
+		     (string-match-p "\\`ATTR_[-_A-Za-z0-9]+\\'" key))
 		   (member key keywords))
 	       (list (org-element-property :post-affiliated k)
 		     (format "Orphaned affiliated keyword: \"%s\"" key))))))))
@@ -452,7 +452,7 @@ Use :header-args: instead"
 	(list (org-element-property :post-affiliated b)
 	      "Invalid syntax in babel call block"))
        ((let ((h (org-element-property :end-header b)))
-	  (and h (org-string-match-p "\\`\\[.*\\]\\'" h)))
+	  (and h (string-match-p "\\`\\[.*\\]\\'" h)))
 	(list
 	 (org-element-property :post-affiliated b)
 	 "Babel call's end header must not be wrapped within brackets"))))))
@@ -738,7 +738,7 @@ Use \"export %s\" instead"
     (lambda (e)
       (let ((name (org-element-property :name e)))
 	(and name
-	     (org-string-match-p ":" name)
+	     (string-match-p ":" name)
 	     (list (progn
 		     (goto-char (org-element-property :begin e))
 		     (re-search-forward
diff --git a/lisp/org-list.el b/lisp/org-list.el
index dcd635694..57dedcd90 100644
--- a/lisp/org-list.el
+++ b/lisp/org-list.el
@@ -2095,8 +2095,8 @@ Possible values are: `folded', `children' or `subtree'.  See
 	  (if (> start (+ ind org-list-description-max-indent)) (+ ind 5) start))
       (+ (progn (goto-char (match-end 1)) (current-column))
 	 (if (and org-list-two-spaces-after-bullet-regexp
-		  (org-string-match-p org-list-two-spaces-after-bullet-regexp
-				      (match-string 1)))
+		  (string-match-p org-list-two-spaces-after-bullet-regexp
+				  (match-string 1)))
 	     2
 	   1)))))
 
diff --git a/lisp/org-macro.el b/lisp/org-macro.el
index 0e650f56b..18e24deca 100644
--- a/lisp/org-macro.el
+++ b/lisp/org-macro.el
@@ -191,54 +191,54 @@ found in the buffer with no definition in TEMPLATES.
 Optional argument KEYWORDS, when non-nil is a list of keywords,
 as strings, where macro expansion is allowed."
   (org-with-wide-buffer
-    (goto-char (point-min))
-    (let ((properties-regexp
-	   (format "\\`EXPORT_%s\\+?\\'" (regexp-opt keywords)))
-	  record)
-      (while (re-search-forward "{{{[-A-Za-z0-9_]" nil t)
-	(let* ((datum (save-match-data (org-element-context)))
-	       (type (org-element-type datum))
-	       (macro
-		(cond
-		 ((eq type 'macro) datum)
-		 ;; In parsed keywords and associated node properties,
-		 ;; force macro recognition.
-		 ((or (and (eq type 'keyword)
-			   (member (org-element-property :key datum) keywords))
-		      (and (eq type 'node-property)
-			   (org-string-match-p
-			    properties-regexp
-			    (org-element-property :key datum))))
-		  (save-restriction
-		    (narrow-to-region (match-beginning 0) (line-end-position))
-		    (org-element-map (org-element-parse-buffer) 'macro
-		      #'identity nil t))))))
-	  (when macro
-	    (let* ((value (org-macro-expand macro templates))
-		   (begin (org-element-property :begin macro))
-		   (signature (list begin
-				    macro
-				    (org-element-property :args macro))))
-	      ;; Avoid circular dependencies by checking if the same
-	      ;; macro with the same arguments is expanded at the same
-	      ;; position twice.
-	      (cond ((member signature record)
-		     (error "Circular macro expansion: %s"
-			    (org-element-property :key macro)))
-		    (value
-		     (push signature record)
-		     (delete-region
-		      begin
-		      ;; Preserve white spaces after the macro.
-		      (progn (goto-char (org-element-property :end macro))
-			     (skip-chars-backward " \t")
-			     (point)))
-		     ;; Leave point before replacement in case of
-		     ;; recursive expansions.
-		     (save-excursion (insert value)))
-		    (finalize
-		     (error "Undefined Org macro: %s; aborting"
-			    (org-element-property :key macro)))))))))))
+   (goto-char (point-min))
+   (let ((properties-regexp
+	  (format "\\`EXPORT_%s\\+?\\'" (regexp-opt keywords)))
+	 record)
+     (while (re-search-forward "{{{[-A-Za-z0-9_]" nil t)
+       (let* ((datum (save-match-data (org-element-context)))
+	      (type (org-element-type datum))
+	      (macro
+	       (cond
+		((eq type 'macro) datum)
+		;; In parsed keywords and associated node properties,
+		;; force macro recognition.
+		((or (and (eq type 'keyword)
+			  (member (org-element-property :key datum) keywords))
+		     (and (eq type 'node-property)
+			  (string-match-p
+			   properties-regexp
+			   (org-element-property :key datum))))
+		 (save-restriction
+		   (narrow-to-region (match-beginning 0) (line-end-position))
+		   (org-element-map (org-element-parse-buffer) 'macro
+		     #'identity nil t))))))
+	 (when macro
+	   (let* ((value (org-macro-expand macro templates))
+		  (begin (org-element-property :begin macro))
+		  (signature (list begin
+				   macro
+				   (org-element-property :args macro))))
+	     ;; Avoid circular dependencies by checking if the same
+	     ;; macro with the same arguments is expanded at the same
+	     ;; position twice.
+	     (cond ((member signature record)
+		    (error "Circular macro expansion: %s"
+			   (org-element-property :key macro)))
+		   (value
+		    (push signature record)
+		    (delete-region
+		     begin
+		     ;; Preserve white spaces after the macro.
+		     (progn (goto-char (org-element-property :end macro))
+			    (skip-chars-backward " \t")
+			    (point)))
+		    ;; Leave point before replacement in case of
+		    ;; recursive expansions.
+		    (save-excursion (insert value)))
+		   (finalize
+		    (error "Undefined Org macro: %s; aborting"
+			   (org-element-property :key macro)))))))))))
 
 (defun org-macro-escape-arguments (&rest args)
   "Build macro's arguments string from ARGS.
diff --git a/lisp/org-plot.el b/lisp/org-plot.el
index 867ad8acf..d014a8bfd 100644
--- a/lisp/org-plot.el
+++ b/lisp/org-plot.el
@@ -218,7 +218,7 @@ manner suitable for prepending to a user-specified script."
     (mapc ats lines)					       ; line
     (dolist (el sets) (funcall ats (format "set %s" el)))      ; set
     ;; Unless specified otherwise, values are TAB separated.
-    (unless (org-string-match-p "^set datafile separator" script)
+    (unless (string-match-p "^set datafile separator" script)
       (funcall ats "set datafile separator \"\\t\""))
     (when x-labels			; x labels (xtics)
       (funcall ats
diff --git a/lisp/org-table.el b/lisp/org-table.el
index 3d5960218..3a23862a7 100644
--- a/lisp/org-table.el
+++ b/lisp/org-table.el
@@ -689,7 +689,7 @@ extension of the given file name, and finally on the variable
 		   (or (car (delq nil
 				  (mapcar
 				   (lambda (f)
-				     (and (org-string-match-p fileext f) f))
+				     (and (string-match-p fileext f) f))
 				   formats)))
 		       org-table-export-default-format)
 		   t t) t t)))
@@ -756,7 +756,7 @@ When nil, simply write \"#ERROR\" in corrupted fields.")
             ;; Table's rows.  Separators are replaced by nil.  Trailing
             ;; spaces are also removed.
             (lines (mapcar (lambda (l)
-                             (and (not (org-string-match-p "\\`[ \t]*|-" l))
+                             (and (not (string-match-p "\\`[ \t]*|-" l))
                                   (let ((l (org-trim l)))
                                     (remove-text-properties
                                      0 (length l) '(display t org-cwidth t) l)
@@ -833,7 +833,7 @@ edit.  Full value is:\n"
                  (unless (equal x "")
                    (setq frac
                          (/ (+ (* frac cnt)
-                               (if (org-string-match-p org-table-number-regexp x)
+                               (if (string-match-p org-table-number-regexp x)
                                    1
                                  0))
                             (cl-incf cnt)))))
@@ -2313,7 +2313,7 @@ LOCATION is a buffer position, consider the formulas there."
 		       (cond
 			((not (match-end 2)) m)
 			;; Is it a column reference?
-			((org-string-match-p "\\`$\\([0-9]+\\|[<>]+\\)\\'" m) m)
+			((string-match-p "\\`$\\([0-9]+\\|[<>]+\\)\\'" m) m)
 			;; Since named columns are not possible in
 			;; LHS, assume this is a named field.
 			(t (match-string 2 string)))))
@@ -2926,7 +2926,7 @@ When CORNERS-ONLY is set, only return the corners of the range as
 a list (line1 column1 line2 column2) where line1 and line2 are
 line numbers relative to beginning of table, or TBEG, and column1
 and column2 are table column numbers."
-  (let* ((desc (if (org-string-match-p "\\`\\$[0-9]+\\.\\.\\$[0-9]+\\'" desc)
+  (let* ((desc (if (string-match-p "\\`\\$[0-9]+\\.\\.\\$[0-9]+\\'" desc)
 		   (replace-regexp-in-string "\\$" "@0$" desc)
 		 desc))
 	 (col (or col (org-table-current-column)))
@@ -3170,7 +3170,7 @@ existing formula for column %s"
 				      new))
 			new))
 		     (t old-lhs)))))
-	     (if (org-string-match-p "\\`\\$[0-9]+\\'" lhs)
+	     (if (string-match-p "\\`\\$[0-9]+\\'" lhs)
 		 (push (cons lhs rhs) eqlcol)
 	       (push (cons lhs rhs) eqlfield))))
 	 (setq eqlcol (nreverse eqlcol))
@@ -3383,13 +3383,13 @@ function assumes the table is already analyzed (i.e., using
       (let ((lhs (car e))
 	    (rhs (cdr e)))
 	(cond
-	 ((org-string-match-p "\\`@-?[-+0-9]+\\$-?[0-9]+\\'" lhs)
+	 ((string-match-p "\\`@-?[-+0-9]+\\$-?[0-9]+\\'" lhs)
 	  ;; This just refers to one fixed field.
 	  (push e res))
-	 ((org-string-match-p "\\`[a-zA-Z][_a-zA-Z0-9]*\\'" lhs)
+	 ((string-match-p "\\`[a-zA-Z][_a-zA-Z0-9]*\\'" lhs)
 	  ;; This just refers to one fixed named field.
 	  (push e res))
-	 ((org-string-match-p "\\`\\$[0-9]+\\'" lhs)
+	 ((string-match-p "\\`\\$[0-9]+\\'" lhs)
 	  ;; Column formulas are treated specially and are not
 	  ;; expanded.
 	  (push e res))
@@ -3445,7 +3445,7 @@ borders of the table using the @< @> $< $> makers."
   "Replace $const with values in string F."
   (let ((start 0)
 	(pp (/= (string-to-char f) ?'))
-	(duration (org-string-match-p ";.*[Tt].*\\'" f))
+	(duration (string-match-p ";.*[Tt].*\\'" f))
 	(new (replace-regexp-in-string	; Check for column names.
 	      org-table-column-name-regexp
 	      (lambda (m)
@@ -3988,10 +3988,10 @@ When LOCAL is non-nil, show references for the table at point."
 	(when dest
 	  (setq name (substring dest 1))
 	  (cond
-	   ((org-string-match-p "\\`\\$[a-zA-Z][a-zA-Z0-9]*" dest)
+	   ((string-match-p "\\`\\$[a-zA-Z][a-zA-Z0-9]*" dest)
 	    (org-table-goto-field dest))
-	   ((org-string-match-p "\\`@\\([1-9][0-9]*\\)\\$\\([1-9][0-9]*\\)\\'"
-				dest)
+	   ((string-match-p "\\`@\\([1-9][0-9]*\\)\\$\\([1-9][0-9]*\\)\\'"
+			    dest)
 	    (org-table-goto-field dest))
 	   (t (org-table-goto-column (string-to-number name))))
 	  (move-marker pos (point))
@@ -5197,7 +5197,7 @@ supported.  It is also possible to use the following one:
 	   params)))
 	(columns (let ((w (plist-get params :columns)))
 		   (cond ((not w) nil)
-			 ((org-string-match-p "{\\|@columnfractions " w) w)
+			 ((string-match-p "{\\|@columnfractions " w) w)
 			 (t (concat "@columnfractions " w))))))
     (if (not columns) output
       (replace-regexp-in-string
@@ -5438,7 +5438,7 @@ distinguished from a plain table name or ID."
        (save-match-data
 	 (let ((eq (org-table-formula-handle-first/last-rc (match-string 1 m))))
 	   (org-table-get-range
-	    (if (org-string-match-p "\\`\\$[0-9]+\\'" eq)
+	    (if (string-match-p "\\`\\$[0-9]+\\'" eq)
 		(concat "@0" eq)
 	      eq)))))
      form t t 1)))
diff --git a/lisp/org.el b/lisp/org.el
index 1e4a91df5..e183053fe 100644
--- a/lisp/org.el
+++ b/lisp/org.el
@@ -10200,7 +10200,7 @@ according to FMT (default from `org-email-link-description-format')."
 		   ;; square brackets).  File links however, are
 		   ;; encoded since, e.g., spaces are significant.
 		   ((or (file-name-absolute-p link)
-			(org-string-match-p "\\`\\.\\.?/\\|[][]" link))
+			(string-match-p "\\`\\.\\.?/\\|[][]" link))
 		    (org-link-escape link))
 		   (t link)))
 	(description
@@ -10752,13 +10752,11 @@ PATH is the sexp to evaluate, as a string."
   (let ((cmd path))
     (if (or (and (org-string-nw-p
 		  org-confirm-elisp-link-not-regexp)
-		 (org-string-match-p
-		  org-confirm-elisp-link-not-regexp cmd))
+		 (string-match-p org-confirm-elisp-link-not-regexp cmd))
 	    (not org-confirm-elisp-link-function)
 	    (funcall org-confirm-elisp-link-function
 		     (format "Execute \"%s\" as elisp? "
-			     (org-add-props cmd nil
-			       'face 'org-warning))))
+			     (org-add-props cmd nil 'face 'org-warning))))
 	(message "%s => %s" cmd
 		 (if (eq (string-to-char cmd) ?\()
 		     (eval (read cmd))
@@ -10925,7 +10923,7 @@ link in a property drawer line."
 				   ((equal app "emacs") 'emacs)
 				   ((equal app "sys") 'system))
 			     (cond ((not option) nil)
-				   ((org-string-match-p "\\`[0-9]+\\'" option)
+				   ((string-match-p "\\`[0-9]+\\'" option)
 				    (list (string-to-number option)))
 				   (t (list nil
 					    (org-link-unescape option)))))))))
@@ -13878,16 +13876,16 @@ EXTRA is additional text that will be inserted into the notes buffer."
 			       org-log-note-effective-time))
 		   (cons "%s" (cond
 			       ((not org-log-note-state) "")
-			       ((org-string-match-p org-ts-regexp
-						    org-log-note-state)
+			       ((string-match-p org-ts-regexp
+						org-log-note-state)
 				(format "\"[%s]\""
 					(substring org-log-note-state 1 -1)))
 			       (t (format "\"%s\"" org-log-note-state))))
 		   (cons "%S"
 			 (cond
 			  ((not org-log-note-previous-state) "")
-			  ((org-string-match-p org-ts-regexp
-					       org-log-note-previous-state)
+			  ((string-match-p org-ts-regexp
+					   org-log-note-previous-state)
 			   (format "\"[%s]\""
 				   (substring
 				    org-log-note-previous-state 1 -1)))
@@ -14535,7 +14533,7 @@ also TODO lines."
   (if (or (eq t org-use-property-inheritance)
 	  (and (stringp org-use-property-inheritance)
 	       (let ((case-fold-search t))
-		 (org-string-match-p org-use-property-inheritance property)))
+		 (string-match-p org-use-property-inheritance property)))
 	  (and (listp org-use-property-inheritance)
 	       (member-ignore-case property org-use-property-inheritance)))
       ;; Caching is not possible, check it directly.
@@ -15688,7 +15686,7 @@ Being in this list makes sure that they are offered for completion.")
   "Non nil when string PROPERTY is a valid property name."
   (not
    (or (equal property "")
-       (org-string-match-p "\\s-" property))))
+       (string-match-p "\\s-" property))))
 
 (defun org--update-property-plist (key val props)
   "Associate KEY to VAL in alist PROPS.
@@ -15993,7 +15991,7 @@ strings."
 		    ;; properties to be named as special properties.
 		    (while (re-search-forward org-property-re end t)
 		      (let* ((key (upcase (match-string-no-properties 2)))
-			     (extendp (org-string-match-p "\\+\\'" key))
+			     (extendp (string-match-p "\\+\\'" key))
 			     (key-base (if extendp (substring key 0 -1) key))
 			     (value (match-string-no-properties 3)))
 			(cond
@@ -16336,7 +16334,7 @@ automatically performed, such drawers will be silently ignored."
 	       (let ((p (progn (looking-at org-property-re)
 			       (match-string-no-properties 2))))
 		 ;; Only add true property name, not extension symbol.
-		 (push (if (not (org-string-match-p "\\+\\'" p)) p
+		 (push (if (not (string-match-p "\\+\\'" p)) p
 			 (substring p 0 -1))
 		       props))
 	       (forward-line))))
@@ -16404,7 +16402,7 @@ Point is left between drawer's boundaries."
      ;; With C-u, fall back on `org-insert-property-drawer'
      (arg (org-insert-property-drawer))
      ;; Check validity of suggested drawer's name.
-     ((not (org-string-match-p org-drawer-regexp (format ":%s:" drawer)))
+     ((not (string-match-p org-drawer-regexp (format ":%s:" drawer)))
       (user-error "Invalid drawer name"))
      ;; With an active region, insert a drawer at point.
      ((not (org-region-active-p))
@@ -19722,8 +19720,8 @@ boundaries."
 		      (let ((parent (org-element-property :parent link)))
 			(or (not (eq (org-element-type parent) 'link))
 			    (not (cdr (org-element-contents parent)))))
-		      (org-string-match-p file-extension-re
-					  (org-element-property :path link)))
+		      (string-match-p file-extension-re
+				      (org-element-property :path link)))
 	     (let ((file (expand-file-name
 			  (org-link-unescape
 			   (org-element-property :path link)))))
@@ -24120,8 +24118,8 @@ unless optional argument NO-INHERITANCE is non-nil."
    ((let ((headline (nth 4 (org-heading-components))))
       (and headline
 	   (let ((case-fold-search nil))
-	     (org-string-match-p (concat "^" org-comment-string "\\(?: \\|$\\)")
-				 headline)))))
+	     (string-match-p (concat "^" org-comment-string "\\(?: \\|$\\)")
+			     headline)))))
    (no-inheritance nil)
    (t
     (save-excursion (and (org-up-heading-safe) (org-in-commented-heading-p))))))
diff --git a/lisp/ox-ascii.el b/lisp/ox-ascii.el
index 6c707f8d0..e954980f8 100644
--- a/lisp/ox-ascii.el
+++ b/lisp/ox-ascii.el
@@ -1480,14 +1480,14 @@ information."
       (org-ascii--justify-element
        (let ((case-fold-search t))
 	 (cond
-	  ((org-string-match-p "\\<headlines\\>" value)
+	  ((string-match-p "\\<headlines\\>" value)
 	   (let ((depth (and (string-match "\\<[0-9]+\\>" value)
 			     (string-to-number (match-string 0 value))))
-		 (localp (org-string-match-p "\\<local\\>" value)))
+		 (localp (string-match-p "\\<local\\>" value)))
 	     (org-ascii--build-toc info depth keyword localp)))
-	  ((org-string-match-p "\\<tables\\>" value)
+	  ((string-match-p "\\<tables\\>" value)
 	   (org-ascii--list-tables keyword info))
-	  ((org-string-match-p "\\<listings\\>" value)
+	  ((string-match-p "\\<listings\\>" value)
 	   (org-ascii--list-listings keyword info))))
        keyword info)))))
 
diff --git a/lisp/ox-beamer.el b/lisp/ox-beamer.el
index 4505e2c13..3b42f6066 100644
--- a/lisp/ox-beamer.el
+++ b/lisp/ox-beamer.el
@@ -451,7 +451,7 @@ used as a communication channel."
 			(let ((label (org-beamer--get-label headline info)))
 			  ;; Labels containing colons need to be
 			  ;; wrapped within braces.
-			  (format (if (org-string-match-p ":" label)
+			  (format (if (string-match-p ":" label)
 				      "label={%s}"
 				    "label=%s")
 				  label)))))))
diff --git a/lisp/ox-html.el b/lisp/ox-html.el
index ce4694df1..cbcd65ec9 100644
--- a/lisp/ox-html.el
+++ b/lisp/ox-html.el
@@ -2743,7 +2743,7 @@ CONTENTS is nil.  INFO is a plist holding contextual information."
 	 ((string-match "\\<headlines\\>" value)
 	  (let ((depth (and (string-match "\\<[0-9]+\\>" value)
 			    (string-to-number (match-string 0 value))))
-		(localp (org-string-match-p "\\<local\\>" value)))
+		(localp (string-match-p "\\<local\\>" value)))
 	    (org-html-toc depth info (and localp keyword))))
 	 ((string= "listings" value) (org-html-list-of-listings info))
 	 ((string= "tables" value) (org-html-list-of-tables info))))))))
diff --git a/lisp/ox-latex.el b/lisp/ox-latex.el
index 090172693..991d5272e 100644
--- a/lisp/ox-latex.el
+++ b/lisp/ox-latex.el
@@ -1251,7 +1251,7 @@ Eventually, if FULL is non-nil, wrap label within \"\\label{}\"."
 			   (headline "sec:")
 			   (table "tab:")
 			   (latex-environment
-			    (and (org-string-match-p
+			    (and (string-match-p
 				  org-latex-math-environments-re
 				  (org-element-property :value datum))
 				 "eq:"))
@@ -1924,7 +1924,8 @@ holding contextual information."
 		    (format "\\begin{%s}\n" (if numberedp 'enumerate 'itemize)))
 		  ;; Itemize headline
 		  "\\item"
-		  (and full-text (org-string-match-p "\\`[ \t]*\\[" full-text)
+		  (and full-text
+		       (string-match-p "\\`[ \t]*\\[" full-text)
 		       "\\relax")
 		  " " full-text "\n"
 		  headline-label
@@ -1961,8 +1962,8 @@ holding contextual information."
 		    (lambda (k)
 		      (and (equal (org-element-property :key k) "TOC")
 			   (let ((v (org-element-property :value k)))
-			     (and (org-string-match-p "\\<headlines\\>" v)
-				  (org-string-match-p "\\<local\\>" v)
+			     (and (string-match-p "\\<headlines\\>" v)
+				  (string-match-p "\\<local\\>" v)
 				  (format "\\stopcontents[level-%d]" level)))))
 		    info t)))))
 	  (if (and opt-title
@@ -2150,7 +2151,7 @@ contextual information."
 	     ;; unless the brackets comes from an initial export
 	     ;; snippet (i.e. it is inserted willingly by the user).
 	     ((and contents
-		   (org-string-match-p "\\`[ \t]*\\[" contents)
+		   (string-match-p "\\`[ \t]*\\[" contents)
 		   (not (let ((e (car (org-element-contents item))))
 			  (and (eq (org-element-type e) 'paragraph)
 			       (let ((o (car (org-element-contents e))))
@@ -2182,8 +2183,8 @@ CONTENTS is nil.  INFO is a plist holding contextual information."
      ((string= key "TOC")
       (let ((case-fold-search t))
 	(cond
-	 ((org-string-match-p "\\<headlines\\>" value)
-	  (let* ((localp (org-string-match-p "\\<local\\>" value))
+	 ((string-match-p "\\<headlines\\>" value)
+	  (let* ((localp (string-match-p "\\<local\\>" value))
 		 (parent (org-element-lineage keyword '(headline)))
 		 (level (if (not (and localp parent)) 0
 			  (org-export-get-relative-level parent info)))
@@ -2199,8 +2200,8 @@ CONTENTS is nil.  INFO is a plist holding contextual information."
 \\printcontents[level-%d]{}{0}{%s}"
 			level level (or depth ""))
 	      (concat depth (and depth "\n") "\\tableofcontents"))))
-	 ((org-string-match-p "\\<tables\\>" value) "\\listoftables")
-	 ((org-string-match-p "\\<listings\\>" value)
+	 ((string-match-p "\\<tables\\>" value) "\\listoftables")
+	 ((string-match-p "\\<listings\\>" value)
 	  (cl-case (plist-get info :latex-listings)
 	    ((nil) "\\listoffigures")
 	    (minted "\\listoflistings")
@@ -2326,8 +2327,8 @@ used as a communication channel."
       (let ((search-option (org-element-property :search-option link)))
         (when (and search-option
                    (equal filetype "pdf")
-                   (org-string-match-p "\\`[0-9]+\\'" search-option)
-                   (not (org-string-match-p "page=" options)))
+                   (string-match-p "\\`[0-9]+\\'" search-option)
+                   (not (string-match-p "page=" options)))
           (setq options (concat options ",page=" search-option))))
       (setq image-code
 	    (format "\\includegraphics%s{%s}"
@@ -2814,7 +2815,7 @@ contextual information."
        (custom-env
 	(let ((caption-str (org-latex--caption/label-string src-block info))
               (formatted-src (org-export-format-code-default src-block info)))
-          (if (org-string-match-p "\\`[a-zA-Z0-9]+\\'" custom-env)
+          (if (string-match-p "\\`[a-zA-Z0-9]+\\'" custom-env)
 	      (format "\\begin{%s}\n%s\\end{%s}\n"
 		      custom-env
 		      (concat (and caption-above-p caption-str)
diff --git a/lisp/ox-odt.el b/lisp/ox-odt.el
index 29a0b8573..4aee7b543 100644
--- a/lisp/ox-odt.el
+++ b/lisp/ox-odt.el
@@ -200,8 +200,7 @@ heuristically based on the values of `org-odt-lib-dir' and
 			   (file-readable-p
 			    (expand-file-name
 			     "OrgOdtStyles.xml" styles-dir)))
-		  (message "Debug (ox-odt): Using styles under %s"
-			   styles-dir)
+		  (message "Debug (ox-odt): Using styles under %s" styles-dir)
 		  (throw 'styles-dir styles-dir)))))))
     (unless styles-dir
       (error "Error (ox-odt): Cannot find factory styles files, aborting"))
@@ -2013,13 +2012,13 @@ information."
      ((string= key "TOC")
       (let ((case-fold-search t))
 	(cond
-	 ((org-string-match-p "\\<headlines\\>" value)
+	 ((string-match-p "\\<headlines\\>" value)
 	  (let ((depth (or (and (string-match "\\<[0-9]+\\>" value)
 				(string-to-number (match-string 0 value)))
 			   (plist-get info :headline-levels)))
-		(localp (org-string-match-p "\\<local\\>" value)))
+		(localp (string-match-p "\\<local\\>" value)))
 	    (org-odt-toc depth info (and localp keyword))))
-	 ((org-string-match-p "tables\\|figures\\|listings" value)
+	 ((string-match-p "tables\\|figures\\|listings" value)
 	  ;; FIXME
 	  (ignore))))))))
 
@@ -3765,7 +3764,7 @@ contextual information."
 						  nil processing-type)
 				(buffer-substring-no-properties
 				 (point-min) (point-max)))))
-		    (if (org-string-match-p "file:\\([^]]*\\)" link) link
+		    (if (string-match-p "file:\\([^]]*\\)" link) link
 		      (message "LaTeX Conversion failed.")
 		      nil))))
 	    (when org-link
diff --git a/lisp/ox-texinfo.el b/lisp/ox-texinfo.el
index be935fefa..e36c1e30e 100644
--- a/lisp/ox-texinfo.el
+++ b/lisp/ox-texinfo.el
@@ -548,7 +548,7 @@ holding export options."
 		     (name (symbol-name (or org-texinfo-coding-system
 					    buffer-file-coding-system))))
 		 (dolist (system org-texinfo-supported-coding-systems "UTF-8")
-		   (when (org-string-match-p (regexp-quote system) name)
+		   (when (string-match-p (regexp-quote system) name)
 		     (throw 'coding-system system))))))
 	    (language (plist-get info :language))
 	    (case-fold-search nil))
@@ -585,7 +585,7 @@ holding export options."
 		 (let ((dirdesc
 			(let ((desc (plist-get info :texinfo-dirdesc)))
 			  (cond ((not desc) nil)
-				((org-string-match-p "\\.$" desc) desc)
+				((string-match-p "\\.$" desc) desc)
 				(t (concat desc "."))))))
 		   (if dirdesc (format "%-23s %s" dirtitle dirdesc) dirtitle))
 		 "\n"
@@ -916,10 +916,10 @@ CONTENTS is nil.  INFO is a plist holding contextual information."
      ((string= key "TINDEX") (format "@tindex %s" value))
      ((string= key "VINDEX") (format "@vindex %s" value))
      ((string= key "TOC")
-      (cond ((org-string-match-p "\\<tables\\>" value)
+      (cond ((string-match-p "\\<tables\\>" value)
 	     (concat "@listoffloats "
 		     (org-export-translate "Table" :utf-8 info)))
-	    ((org-string-match-p "\\<listings\\>" value)
+	    ((string-match-p "\\<listings\\>" value)
 	     (concat "@listoffloats "
 		     (org-export-translate "Listing" :utf-8 info))))))))
 
@@ -1307,8 +1307,8 @@ as a communication channel."
   "Transcode a SRC-BLOCK element from Org to Texinfo.
 CONTENTS holds the contents of the item.  INFO is a plist holding
 contextual information."
-  (let* ((lisp (org-string-match-p "lisp"
-				   (org-element-property :language src-block)))
+  (let* ((lisp (string-match-p "lisp"
+			       (org-element-property :language src-block)))
 	 (code (org-texinfo--sanitize-content
 		(org-export-format-code-default src-block info)))
 	 (value (format
diff --git a/lisp/ox.el b/lisp/ox.el
index 8472e9dee..929aa8c84 100644
--- a/lisp/ox.el
+++ b/lisp/ox.el
@@ -4151,8 +4151,8 @@ This only applies to links without a description."
 	 (catch 'exit
 	   (dolist (rule (or rules org-export-default-inline-image-rule))
 	     (and (string= (org-element-property :type link) (car rule))
-		  (org-string-match-p (cdr rule)
-				      (org-element-property :path link))
+		  (string-match-p (cdr rule)
+				  (org-element-property :path link))
 		  (throw 'exit t)))))))
 
 (defun org-export-resolve-coderef (ref info)
@@ -4335,7 +4335,7 @@ has type \"radio\"."
 
 (defun org-export-file-uri (filename)
   "Return file URI associated to FILENAME."
-  (cond ((org-string-match-p "\\`//" filename) (concat "file:" filename))
+  (cond ((string-match-p "\\`//" filename) (concat "file:" filename))
 	((not (file-name-absolute-p filename)) filename)
 	((org-file-remote-p filename) (concat "file:/" filename))
 	(t (concat "file://" (expand-file-name filename)))))
diff --git a/testing/lisp/test-org-table.el b/testing/lisp/test-org-table.el
index c036ece4c..908ba707a 100644
--- a/testing/lisp/test-org-table.el
+++ b/testing/lisp/test-org-table.el
@@ -1434,7 +1434,7 @@ See also `test-org-table/copy-field'."
   ;; Test :raw parameter.
   (when (featurep 'ox-latex)
     (should
-     (org-string-match-p
+     (string-match-p
       "/a/"
       (orgtbl-to-generic (org-table-to-lisp "| /a/ | b |")
 			 '(:backend latex :raw t)))))
@@ -1471,7 +1471,7 @@ See also `test-org-table/copy-field'."
 			   '(:environment "tabularx"))))
   ;; Test :booktabs parameter.
   (should
-   (org-string-match-p
+   (string-match-p
     "\\toprule" (orgtbl-to-latex (org-table-to-lisp "| a |") '(:booktabs t))))
   ;; Handle LaTeX snippets.
   (should
@@ -1479,7 +1479,7 @@ See also `test-org-table/copy-field'."
 	  (orgtbl-to-latex (org-table-to-lisp "| $x$ |") nil)))
   ;; Test pseudo objects and :raw parameter.
   (should
-   (org-string-match-p
+   (string-match-p
     "\\$x\\$" (orgtbl-to-latex (org-table-to-lisp "| $x$ |") '(:raw t)))))
 
 (ert-deftest test-org-table/to-html ()
@@ -1500,11 +1500,11 @@ See also `test-org-table/copy-field'."
 </table>"))
   ;; Test :attributes parameter.
   (should
-   (org-string-match-p
+   (string-match-p
     "<table>"
     (orgtbl-to-html (org-table-to-lisp "| a |") '(:attributes nil))))
   (should
-   (org-string-match-p
+   (string-match-p
     "<table border=\"2\">"
     (orgtbl-to-html (org-table-to-lisp "| a |") '(:attributes (:border "2"))))))
 
@@ -1842,7 +1842,7 @@ is t, then new columns should be added as needed"
 (ert-deftest test-org-table/named-field ()
   "Test formula with a named field."
   (should
-   (org-string-match-p
+   (string-match-p
     "| +| +1 +|"
     (org-test-with-temp-text "
 |   |      |
@@ -1851,7 +1851,7 @@ is t, then new columns should be added as needed"
       (org-table-calc-current-TBLFM)
       (buffer-string))))
   (should
-   (org-string-match-p
+   (string-match-p
     "| +| +1 +|"
     (org-test-with-temp-text "
 | _ | name |
@@ -1863,7 +1863,7 @@ is t, then new columns should be added as needed"
 (ert-deftest test-org-table/named-column ()
   "Test formula with a named field."
   (should
-   (org-string-match-p
+   (string-match-p
     "| +| +1 +| +1 +|"
     (org-test-with-temp-text "
 | ! | name |   |
@@ -1875,7 +1875,7 @@ is t, then new columns should be added as needed"
 (ert-deftest test-org-table/tab-indent ()
   "Test named fields with tab indentation."
   (should
-   (org-string-match-p
+   (string-match-p
     "| # | 111 |"
     (org-test-with-temp-text
 	"
@@ -1890,7 +1890,7 @@ is t, then new columns should be added as needed"
 (ert-deftest test-org-table/first-rc ()
   "Test \"$<\" and \"@<\" constructs in formulas."
   (should
-   (org-string-match-p
+   (string-match-p
     "| 1 | 2 |"
     (org-test-with-temp-text
 	"|   | 2 |
@@ -1898,7 +1898,7 @@ is t, then new columns should be added as needed"
       (org-table-calc-current-TBLFM)
       (buffer-string))))
   (should
-   (org-string-match-p
+   (string-match-p
     "| 2 |\n| 2 |"
     (org-test-with-temp-text
 	"| 2 |\n|   |
@@ -1909,14 +1909,14 @@ is t, then new columns should be added as needed"
 (ert-deftest test-org-table/last-rc ()
   "Test \"$>\" and \"@>\" constructs in formulas."
   (should
-   (org-string-match-p
+   (string-match-p
     "| 2 | 1 |"
     (org-test-with-temp-text
 	"| 2 |   |\n<point>#+TBLFM: $>=1"
       (org-table-calc-current-TBLFM)
       (buffer-string))))
   (should
-   (org-string-match-p
+   (string-match-p
     "| 2 |\n| 2 |"
     (org-test-with-temp-text
 	"| 2 |\n|   |\n<point>#+TBLFM: @>$1=@<"