Hi all, After updating from Cygwin-3.4.10 to recent 3.6.9, I noticed some unexpected behavior in some of my Bash scripts. While regular expressions mainly work, I found that the following does not:
$ arg_board="x"; [[ "${arg_board:-}" =~ ^(custom|)$ ]]; echo $?
2
$ arg_board=""; [[ "${arg_board:-}" =~ ^(custom|)$ ]]; echo $?
2
The expected return value should be either 1 for the first example or 0 for
the second one - which works in Cygwin-3.4.10.
Any idea?
Some version numbers:
$ cat /proc/version
CYGWIN_NT-10.0-26200 version 3.6.9-1.x86_64 (runneradmin@runnervmxu3fp) (gcc
version 13.4.0 (GCC) ) 2026-04-21 15:46 UTC
bash 5.2.21-1
base-cygwin 3.8-2
cygutils 1.4.17-4
cygwin 3.6.9-1
cygwin-devel 3.6.9-1
Please let me know if you need further information.
--
Thanks and kind regards,
Gerhard
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