[PATCH] Re: Bug: Plain https links with brackets are not recognised [9.4.4 (release_9.4.4-625-g763c7a @ /home/yantar92/.emacs.d/straight/build/org/)]

[Ihor Radchenko <yantar92@gmail.com>]

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Kyle Meyer <kyle@kyleam.com> writes:

> This case was discussed at
> <https://orgmode.org/list/5faf0bd7-b114-9723-773e-7f3da16604a0@grinta.net/T/#u>.
> There's mention of an improved regexp that might be worth trying.

The improved regexp appears to work for me. I tried my best to transform
the regexp provided in the link to rx notation. The patch is attached.

Best,
Ihor


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From 79eaa3b5b71f2aba02d4f17b860f67a6a77255fc Mon Sep 17 00:00:00 2001
From: Ihor Radchenko <yantar92@gmail.com>
Date: Sat, 13 Mar 2021 13:16:06 +0800
Subject: [PATCH] Improve org-link-plain-re

* lisp/ol.el (org-link-make-regexps): Allow URLs with up to two levels
of nested brackets.  Now, URLs like [1] can be matched.  The new
regexp is taken from [2].

[1] https://doi.org/10.1016/0160-791x(79)90023-x
[2] https://daringfireball.net/2010/07/improved_regex_for_matching_urls
---
 lisp/ol.el | 30 +++++++++++++++++++++---------
 1 file changed, 21 insertions(+), 9 deletions(-)

diff --git a/lisp/ol.el b/lisp/ol.el
index 8b9755b51..0e166de38 100644
--- a/lisp/ol.el
+++ b/lisp/ol.el
@@ -829,15 +829,27 @@ This should be called after the variable `org-link-parameters' has changed."
 	  (format "<%s:\\([^>\n]*\\(?:\n[ \t]*[^> \t\n][^>\n]*\\)*\\)>"
 		  types-re)
 	  org-link-plain-re
-	  (concat
-	   "\\<" types-re ":"
-	   "\\([^][ \t\n()<>]+\\(?:([[:word:]0-9_]+)\\|\\([^[:punct:] \t\n]\\|/\\)\\)\\)")
-	  ;;	 "\\([^]\t\n\r<>() ]+[^]\t\n\r<>,.;() ]\\)")
-	  org-link-bracket-re
-	  (rx (seq "[["
-		   ;; URI part: match group 1.
-		   (group
-		    (one-or-more
+	  (let ((non-space-bracket "[^][ \t\n()<>]+"))
+            ;; Heiristics for an URL link.  Source:
+            ;; https://daringfireball.net/2010/07/improved_regex_for_matching_urls
+            (rx-to-string
+             `(seq (regexp "\\<")
+                   (regexp ,types-re)
+                   ":"
+                   (1+ (or (regex ,non-space-bracket)
+                           (seq "("
+                                (* (or (regex ,non-space-bracket)
+                                       (seq "("
+                                            (regex ,non-space-bracket)
+                                            ")")))
+                                ")")))
+                   (or (seq "("
+                            (* (or (regex ,non-space-bracket)
+                                   (seq "("
+                                        (regex ,non-space-bracket)
+                                        ")")))
+                            ")")
+                       (regexp "\\([^[:punct:] \t\n]\\|/\\)")))))
                      (or (not (any "[]\\"))
 			 (and "\\" (zero-or-more "\\\\") (any "[]"))
 			 (and (one-or-more "\\") (not (any "[]"))))))
-- 
2.26.2