[emacs-w3m:13387] error in process sentinel: w3m-filter-stackexchange: Search failed: "^ </a>"

I just asked this on #[email protected]:

    <incal> hello, with Emacs 25 and
            `emacs-w3m-version' 1.4.632 I can't
            load a page like
            <https://chemistry.stackexchange.com/questions/34190/is-there-any-chemical-that-can-destroy-ptfe-or-teflon>,
            I seem to get a SX specific error,
            namely "error in process sentinel:
            w3m-filter-stackexchange: Search
            failed: "^	</a>"", and then "error in
            process sentinel: Search failed: "^
            </a>""
    <incal> there is a function
            `w3m-filter-stackexchange'

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