Hi Alex
> Alex wrote:
> 1. the syntax diagram is (I think) wrong (or at least misleading) ....
>
>> filter [{lines | items | keys | elements} of] *filterSource* {with | without
>> | [not] matching} [{wildcard pattern | regex pattern}] *filterPattern* [into
>> *targetContainer*]
>>
> in particular, the bit that says .... [{wildcard pattern | regex pattern}]
> ....
>
> It implies that it is optional to have anything there - and that if you do,
> then it can be either one or the other. Nothing there indicates that the
> alternatives are
>
> alternative one: "wildcard pattern" or nothing,
> alternative two: "regex pattern".
>
> Maybe it could be
>
> filter [{lines | items | keys | elements} of] *filterSource* {with | without
> | [not] matching} {[wildcard pattern] | regex pattern} *filterPattern* [into
> *targetContainer*]
>
> (i.e. moving the option [...] inside the alternate {...} - which I think
> gives equivalent possibilities, but makes it clearer which is which; clearer
> at least to me :-)
The problem there is that it is an option. The default if nothing is expressed
is that it is a wildcard pattern. So
filter lines of x with “a”
is the same as
Filter lines of x with wildcard pattern “a”
However, specifying regex pattern explicitly ensures that the filterpattern is
handled as a regex.
> 2. Explicitly say in the description that the phrase "regex pattern" is
> required if the filterpattern is to be interpreted as a regex, while the
> alternative "wildcard pattern" is optional, and is the default, used if
> neither of those phrases occurs.
This is bang on the money and should definitely be added to ensure there is
never any confusion. I’ll implement right away.
Thanks
Sean
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