On 12/29/21 08:31, Davide Brini wrote:
I think you need to use '+' before the offending token
Yes. That's a GNU extension. If you want to be portable to any POSIX implementation, you can use this instead:
expr "X(" : '.*' - 1
A similar example is given in the POSIX spec for 'expr':
https://pubs.opengroup.org/onlinepubs/9699919799/utilities/expr.html
As this is not a bug, I'm closing the bug report.
