diff --git a/README.md b/README.md
index 4b77483..6d7984b 100644
--- a/README.md
+++ b/README.md
@@ -24,4 +24,5 @@ TODO Two search patterns means
 
 TODO Find org-mode racket parser / language: https://github.com/tgbugs/laundry
 
-TODO search in subdirectories
+For word boundaries etc. see:
+https://docs.racket-lang.org/guide/regexp-chars.html#%28part._.P.O.S.I.X_character_classes%29
diff --git a/main.rkt b/main.rkt
index 1ade211..7069c97 100644
--- a/main.rkt
+++ b/main.rkt
@@ -80,6 +80,7 @@ racket main.rkt -p title
 racket main.rkt -n -p title
 racket main.rkt -np title
 racket main.rkt -p rackjure
+racket main.rkt -e ./main.rkt -p [[:blank:]]install([[:cntrl:]]|[[:blank:]])
 racket main.rkt -e \"/home/bost/der/search-notes/main.rkt /home/bost/der/search-notes/README.md\" -p subdir
 "
 
@@ -137,8 +138,11 @@ racket main.rkt -e \"/home/bost/der/search-notes/main.rkt /home/bost/der/search-
          (colorize colorize-matches? display-fn
                    (cdr matches) (cdr patterns)))]))
 
+  ;; - For regexp vs. pregexp - the same must be used also in notes.rkt;
+  ;; - In contrary to the regexp-defining string in the notes.rkt no '.*' must
+  ;;   be used.
   (define regexp-split-match
-    (regexp (format "(?~a:~a)" (case-sensitivity-params) (pattern-param))))
+    (pregexp (format "(?~a:~a)" (case-sensitivity-params) (pattern-param))))
 
   (define colorize-matches? (colorize-matches-param))
 
diff --git a/notes.rkt b/notes.rkt
index cb8d60a..f1b88f6 100644
--- a/notes.rkt
+++ b/notes.rkt
@@ -20,11 +20,21 @@
        #`(begin
            '(#,@((compose
                  (curry map bytes->string/utf-8)
+                 #;
+                 (lambda (s)
+                   (display (format "matches: ~a\n" s))
+                   s)
                  (curry filter
                         (curry regexp-match
                                #;#px"^.*labor.*" #;#rx"^.*labor.*"
                                ((compose
-                                 regexp
+                                 ;; See also the regexp-split-match in the main.rkt
+                                 #;
+                                 (lambda (s)
+                                   (display (format "notes: ~a\n" s))
+                                   s)
+                                 ;; regexp   ;; #rx
+                                 pregexp  ;; #px - posix
                                  #;
                                  (lambda (s)
                                    (display (format "notes: ~a\n" s))