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Re: Bash parameter expansion (remove largest trailing match, remove larg

From: Bruce Lilly
Subject: Re: Bash parameter expansion (remove largest trailing match, remove largest leading match, pattern replacement) does not work
Date: Sat, 29 Aug 2020 16:07:42 -0400

On Sat, Aug 29, 2020, 15:27 Koichi Murase <myoga.murase@gmail.com> wrote:

>  I assumed that you have written like
>   separator2='\057'
>   pattern1="${number1}(${separator1})"
> because otherwise, it doesn't work with ksh93 either.
You are correct.

To explain it in more detail, first, these parameter expansions work
> for me with separator1='/'.  The pattern that you constructed from
> separator2='\057' is just not supported by Bash.

That's surprising, as octal and hexadecimal escapes are fairly common.

  Next, you specify
> exactly the same script `shellbug' to both Bash and ksh93, so I could
> assume that you are missing the Bash-specific `shopt -s extglob' in
> the script because otherwise, ksh93 would have complained it.  That is
> all what I can guess from your original post.
Yes, I'm still looking into that (along with updating a couple of FreeBSD
machines, eating lunch, and monitoring a couple of downloads).  I'll
obviously have to wrap the "shopt" bit in a wrapper; is there some minimum
bash version that supports it?


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