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Yes, as mentioned by @Kusalananda , the quotes are mandatory:
$ dpkg -l | grep "$(apt-cache rdepends hunspell-fr | grep -oP '\s+\K')" # ^ sed -e 's/^\s*|\?//' -e 1s/^ /\'/g -e \$s/$/\'/ )"
$ dpkg -l | grep "$(apt-cache rdepends hunspell-fr | grep -oP '\s+\K')" # ^ ^
$ dpkg -l | grep "$(apt-cache rdepends hunspell-fr | sed -e 's/^\s*|\?//' -e 1s/^/\'/g -e \$s/$/\'/ )"
