Hi.
I received a bug report for gawk by private email that a regexp of
this form: '[^0-9---]' wasn't accepted. The bugaboo here is the "---"; it's
a range expression consisting of minus through minus, and apparently long
ago was how one got a minus into a bracket expression.
This can be seen in current grep also:
$ ./src/grep --version
./src/grep (GNU grep) 2.21
Copyright (C) 2014 Free Software Foundation, Inc.
...
$ ./src/grep '[^0-9---]' /dev/null
./src/grep: Invalid range end
The underlying regex and, I believe, dfa routines don't accept this.
Fixing either of them is beyond my skill range, so I thought I'd
pass this one upstream to you folks.
Thanks!
Arnold
