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From: Sebastian Gniazdowski <sgniazdowski@gmail.com>
Date: Tue, 31 Jul 2018 07:13:47 +0200
Message-ID: <CAKc7PVASk-xPxtfv3YsMhBoO8DYO3Pvr7rMVx+2+XgvEXy0vAA@mail.gmail.com>
Subject: Re: Discovered pattern that ideally parses any quoting. Brackets
 highlighting in FSH.
To: Zsh Users <zsh-users@zsh.org>
Content-Type: text/plain; charset="UTF-8"

There was __idx assign missing, and I fine-tuned readibility, so final version:

_mybuf="A\AB'A'C" #input
while  [[ $_mybuf = (#b)[^ABC\"\'\\]#(([ABC\"\'])|[\\](*))(*) ]]; do
    [[ -n "${match[3]}" ]] && {
        __idx+=${mbegin[1]}+1
        _mybuf="${match[3]:1}" # also skip 1 quoted char
    } || {
        __idx+=${mbegin[1]}
        [[ -z "$__quoting" ]] && {
            if [[ "${match[1]}" = [ABC] ]]; then
                echo "Got ${match[1]}"
            fi
        }

        # Toggle quoting
        [[ "${match[1]}" = \" && "$__quoting" != \' ]] && {
                [[ "$__quoting" = \" ]] && __quoting= || __quoting=\";
        }
        [[ "${match[1]}" = \' && "$__quoting" != \" ]] && {
                [[ "$__quoting" = \' ]] && __quoting= || __quoting=\';
        }

        # The last (*) in the pattern, i.e. remaining
        # string, to become next input to while
        _mybuf="${match[4]}"
   }
done