bug#24907: 26.0.50; Opening bracket in char-class :alnum:

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Andreas Röhler <andreas.roehler@easy-emacs.de> writes:
>
>
> Behind some opening brackets:
>
> [[[[[
>
> Funktion below would skip backward over
>
> (defun my-skb ()
>   (interactive)
>   (skip-chars-backward "[[:alnum:]]"))

Yes, skip-chars-backward doesn't take a regexp, it takes a character
set.  You wanted (skip-chars-backward "[:alnum:]")

    (skip-chars-backward STRING &optional LIM)

    Move point backward, stopping after a char not in STRING
    Move point backward, stopping after a char not in STRING, or at pos LIM.
    See ‘skip-chars-forward’ for details.
    [...]

    (skip-chars-forward STRING &optional LIM)

    Move point forward, stopping before a char not in STRING, or at pos LIM.
    STRING is like the inside of a ‘[...]’ in a regular expression
    except that ‘]’ is never special and ‘\’ quotes ‘^’, ‘-’ or ‘\’
     (but not at the end of a range; quoting is never needed there).
    Thus, with arg "a-zA-Z", this skips letters stopping before first nonletter.
    With arg "^a-zA-Z", skips nonletters stopping before first letter.
    Char classes, e.g. ‘[:alpha:]’, are supported.