Subject: Re: bug#50025: Strange? grep behaviour

From: Simon Josefsson <[email-masked]>
Date: Sun, 15 Aug 2021 16:27:53 +0200

Daniel Forsberg <[email-masked]> writes:

> Hello fellow Grepers!
>
> the following line:
>
> echo -n "9999:egov" | sha256sum | grep -E "[0-9a-f]+" -o | xxd -r -p |
> base32 | grep -E "[0-9A-Z]+" -o
>
> produces the following output
>
> LCBSPBBX6BY6
> VZX6P6TZMMRETTCSPXZU7GJTAPPZCPKF2UJEYDA

This is because W is not part of the Swedish collate class, so A-Z does
not match W, for some strange reason -- I think this has been changed in
recent glibc though.

jas@latte:~$ LANG=sv_SE.UTF-8
jas@latte:~$ echo -n "9999:egov" | sha256sum | grep -E "[0-9a-f]+" -o | xxd -r -p | base32 | grep -E "[0-9A-Z]+" -o
LCBSPBBX6BY6
VZX6P6TZMMRETTCSPXZU7GJTAPPZCPKF2UJEYDA
jas@latte:~$ LANG=C
jas@latte:~$ echo -n "9999:egov" | sha256sum | grep -E "[0-9a-f]+" -o | xxd -r -p | base32 | grep -E "[0-9A-Z]+" -o
LCBSPBBX6BY6WVZX6P6TZMMRETTCSPXZU7GJTAPPZCPKF2UJEYDA
jas@latte:~$ 

/Simon