The bug is about {n,m} regular expression in ed.
ed does not recognize 0 in {n,m} which it should.
This can be demonstrated in the following session: {0,3} fails but {1,3}
succeeds.
$ uname -a
Linux myhost 5.0.0-13-generic #14-Ubuntu SMP Mon Apr 15 14:59:14 UTC 2019
x86_64 x86_64 x86_64 GNU/Linux
$ ed -V
GNU ed 1.15
Copyright (C) 1994 Andrew L. Moore.
Copyright (C) 2019 Antonio Diaz Diaz.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
$ cat ttt
asef
aseg
esfg
aes
sefg
$ echo -e 'g/e\{0,3\}/s//d/g\nwq\n' | ed -s ttt
$ cat ttt
asef
aseg
esfg
aes
sefg
$ echo -e 'g/e\{1,3\}/s//d/g\nwq\n' | ed -s ttt
$ cat ttt
asdf
asdg
dsfg
ads
sdfg
Thanks,
Mike
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