this bug is strange because it appears as if regexp-opt is broken, but the only likely difference is an org upgrade via git clone.
in an org agenda command, the same set of org todo kw works if a regexp was created using mapconcat, but not with regexp-opt. i expected that regexp-opt with 'words is identical to the mapconcat version in functionality in this context. === i am trying to upgrade to recent org 9.5 main. [goal is to eventually use bugfix branch with a couple of patches.] [on main, however, i intend to first try the batch agenda archive speedups. current is org 9.4.6. thank you very very much for those.] i am running 25.1.1 i used git clone from savannah to get the org repo i have not tried -Q yet as that woudl require a lot of setup i compiled with make which defaulted to make oldorg in my current versin of org, this bug does not exist, even though regexp-opt should not have changed. === here is the org-agenda-custom-commands command. i have provided some raw strings produced by the commands. this version errors with "and: Invalid regexp: "Unmatched ( or \\("". toggling backtrace on does not produce a backtrace. but if the regexp-opt is commented out and mapconcat is uncommented, it does not produce an error and it works. it also works with the string /produced by/ mapconcat. but it still fails with the string produced by regexp-opt. i confirmed that the string version of the regexp-opt works using re-search-forward, so idk why it would not work from one version of org. ("ne" "clean up by expired CLOSED" tags (concat ;; the + makes no difference seemingly "+CLOSED<\"<-1w>\"&TODO={^" ;; "DONE" ;; (alpha-org-todo-of--regexp :doneish) ;; (apply #'append (mapcar #'alpha-org-todo-of '(:doneish))) (regexp-opt '("DONEKA" "DONE" "MOSTKA" "MOST" "ANYWAY" "DUPLICATEKA" "DUPLICATE" "MOOTKA" "MOOT" "WAKARANAI") 'words) ;; "\\<\\(ANYWAY\\|D\\(?:ONE\\(?:KA\\)?\\|UPLICATE\\(?:KA\\)?\\)\\|MO\\(?:OT\\(?:KA\\)?\\|ST\\(?:KA\\)?\\)\\|WAKARANAI\\)\\>" ;; (re-search-forward "\\<\\(ANYWAY\\|D\\(?:ONE\\(?:KA\\)?\\|UPLICATE\\(?:KA\\)?\\)\\|MO\\(?:OT\\(?:KA\\)?\\|ST\\(?:KA\\)?\\)\\|WAKARANAI\\)\\>") ;; this line works ;; (mapconcat #'identity (apply #'append (mapcar #'alpha-org-todo-of '(:doneish))) "\\|") ;; this line works ;; "DONEKA\\|DONE\\|MOSTKA\\|MOST\\|ANYWAY\\|DUPLICATEKA\\|DUPLICATE\\|MOOTKA\\|MOOT\\|WAKARANAI" "$}") thanks. -- The Kafka Pandemic A blog about science, health, human rights, and misopathy: https://thekafkapandemic.blogspot.com