On Mon, Dec 11, 2023 at 09:37:42AM +0100, to...@tuxteam.de wrote:
> 2. This is tr, not regexp, so '[A-Za-z0-9.]' isn't doing what you
> think it does. It will match '[', 'A' to 'Z', 'a' to 'z','.' and
> ']'. I guess you want to say 'A-Za-z0-9.'
Well spotted.
> 3. As a convenience, tr has char classes. Perhaps [:alnum:] is for
> you. No idea whether this is a GNU extension
It's POSIX. 100% portable, as long as you ignore any bugs in GNU tr.
Looks like GNU tr in Debian 12 still doesn't handle multibyte characters
correctly:
unicorn:~$ echo 'mañana' | tr ñ X
maXXana
So... as long as you're working in the C locale, where [:alnum:] is
just the ASCII capital and lowercase letters and digits, you should be
fine.
