Add regexp matcher

README.org

@@ -50,11 +50,11 @@ Another way to look at it is like a "query language" for Org buffers.  For examp
          (tags "Emacs")
          (priority >= "B"))) ;; => ((headline (:raw-value "org-board" :begin 1220270 :end 1220403 ...)) ...)
 
-  ;; Find non-done TODO items which are tagged "Emacs" and have priority "B" or higher, and return a
-  ;; list of heading positions:
+  ;; Find non-done items which contain the term "Emacs" and have priority "B" or higher, and
+  ;; return a list of heading positions:
   (org-ql org-agenda-files
     (and (not (done))
-         (tags "Emacs")
+         (regexp "Emacs")
          (priority >= "B"))
     :action-fn (lambda (element)
                  (org-element-property :begin element)))  ;; => (44154 46469 56008 63965 100008 ...)

notes.org

@@ -176,6 +176,16 @@ Doesn't seem to make any difference.
          (done)))
 #+END_SRC
 
+** Regexp matching
+
+#+BEGIN_SRC elisp
+  (org-ql "~/src/emacs/org-super-agenda/test/test.org"
+    (regexp "over"))
+
+  (org-agenda-ng "~/src/emacs/org-super-agenda/test/test.org"
+    (regexp "over"))
+#+END_SRC
+
 ** Screenshot code
 
 #+BEGIN_SRC elisp

org-agenda-ng.el

@@ -128,6 +128,7 @@ NONE-PREDS."
                           (todo #'org-agenda-ng--todo-p)
                           (done #'org-agenda-ng--done-p)
                           (tags #'org-agenda-ng--tags-p)
+                          (regexp #'org-ql--regexp-p)
                           (org-back-to-heading #'outline-back-to-heading))
       (org-with-wide-buffer
        (goto-char (point-min))
@@ -464,3 +465,12 @@ comparator, PRIORITY should be a priority string."
 
 (defun org-agenda-ng--habit-p ()
   (org-is-habit-p))
+
+(defun org-ql--regexp-p (regexp)
+  "Return non-nil if current entry matches REGEXP."
+  (let ((end (or (save-excursion
+                   (outline-next-heading))
+                 (point-max))))
+    (save-excursion
+      (goto-char (line-beginning-position))
+      (re-search-forward regexp end t))))