Re: Eye Reasoner Builtin/N3 question/challenge

Thanks Jos! I will definitely check out the time samples

*Regarding regular expressions:*
I find that string:matches() returns a boolean whether or not the string
matches the regular expression,
I am looking to extract the number from the string based on the regular
expression.
For example, I would like to assign the result of re.match('13.4 kV',
'\d+\\.*\\d*') to a variable, the result being 13.4

*Regarding coalesce:*
Coalesce returns the first non-null value from a list/collection.
I believe there is no concept of null in rdf, so I am thinking this would
be translated into returning the first item from a list that is not empty.
(i'm checking R2RML spec to see how nulls are handled when converting dbms
to rdf)
https://www.ibm.com/docs/en/informix-servers/14.10?topic=expressions-coalesce-function


On Mon, Oct 3, 2022 at 11:11 AM Jos De Roo <josderoo@gmail.com> wrote:

> Indeed and for reasoning with time we have https://www.w3.org/TR/rif-dtb/
> implemented in eye see
> https://github.com/josd/eye/blob/master/reasoning/rif/rifP.n3
>
> dunno what coalesce is, maybe something like in
>
> https://github.com/phochste/Notation3-By-Example/blob/main/string/concatenation.n3
> ?
>
> Jos
>
> -- https://josd.github.io
>
>
> On Mon, Oct 3, 2022 at 5:02 PM tim duval <tim.duval11@gmail.com> wrote:
>
>> I found that string:matches() looks like it can satisfy handling regular
>> expressions
>>
>> Just the other two that I could use some help.
>>
>>
>>
>> On Mon, Oct 3, 2022 at 10:24 AM, tim duval <tim.duval11@gmail.com> wrote:
>>
>>> Hi!
>>>
>>> We are on the verge of implementing N3 for a product I am helping a
>>> client develop and in their due diligence, they are providing me with
>>> challenges to identify what the N3 equivalent is, e.g., Let's see if N3 can
>>> handle this!! (suffice to say there is a little skepticism)....
>>>
>>> Most of the list is easy to handle, though a few of them stuck out to me
>>> that it would be best to ask the community how these might be represented
>>> in N3 (built-in wise):
>>>
>>> *Coalesce:*
>>> Coalesce(@StatusCode,'123')
>>>
>>> *Regex expressions:*
>>> how can regular expressions be used??
>>> e.g., substring('13.4 kv', '(([0-9]+.*)*[0-9]+)') as decimal --> returns
>>> 13.4
>>>
>>> *Convert time to current/provided timezone:*
>>>
>>> session-created-date-utc = "2022-08-15 18:57:40"
>>>
>>> current-timezone = 'CDT'
>>>
>>> result is:  "2022-08-15 12:57:40"
>>>
>>>
>>> Any help is appreciated
>>>
>>>
>>> Thanks!
>>>
>>>
>>> Tim Duval
>>>
>>>
>>>