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From: Greg Wooledge <wooledg@eeg.ccf.org>
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Subject: Re: ${var@P} expansion includes 0x01 and 0x02
Date: Fri, 6 Nov 2015 08:19:42 -0500
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On Thu, Nov 05, 2015 at 06:45:45PM -0600, Dennis Williamson wrote:
> red=$(tput setaf 1)
> none=$(tput sgr0)
> greet='\[$red\]Hello\[$none\]'
> printf '%s\n' "${greet@P}"
> echo -e "${greet@P}"
> read -e -p "${greet@P}"
> 
> Naively stripping the delimiters in this case would leave $redHELLO$none
> where $redHello is unset or worse.

Well, obviously you wouldn't do it that way.  It would be much simpler
to strip the \x01 and \x02 from the output string.