[PATCH] update-copyright: allow en dashes in year ranges

[Paul Eggert]

* build-aux/update-copyright: Match year ranges like "1998--2019",
which are used in the Autoconf manual.
---
 ChangeLog                  | 6 ++++++
 build-aux/update-copyright | 2 +-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/ChangeLog b/ChangeLog
index d27674fa6..ae7adbbd5 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2019-10-14  Paul Eggert  <address@hidden>
+
+       update-copyright: allow en dashes in year ranges
+       * build-aux/update-copyright: Match year ranges like "1998--2019",
+       which are used in the Autoconf manual.
+
 2019-10-13  Paul Eggert  <address@hidden>
 
        * config/srclist.txt: Remove posix/regex_internal.c for now.
diff --git a/build-aux/update-copyright b/build-aux/update-copyright
index b3f6b2980..89ca9bac9 100755
--- a/build-aux/update-copyright
+++ b/build-aux/update-copyright
@@ -192,7 +192,7 @@ while (/(^|\n)(.{0,$prefix_max})$copyright_re/g)
     $holder_re =~ s/\s/$ws_re/g;
     my $stmt_remainder_re =
       "(?:$ws_re$circle_c_re)?"
-      . "$ws_re(?:(?:\\d\\d)?\\d\\d(?:,$ws_re?|-))*"
+      . "$ws_re(?:(?:\\d\\d)?\\d\\d(?:,$ws_re?|--?))*"
       . "((?:\\d\\d)?\\d\\d)$ws_re$holder_re";
     if (/\G$stmt_remainder_re/)
       {
-- 
2.21.0