Hi Daniel, I would not expect STRSTARTS to be any faster than REGEX as neither are indexed. The Virtuoso bif:contains function which is available in both open source and commercial does have a Full Text index which makes it much faster for string searches. So you can use something like:
filter(bif:contains(?name1, '"Insurance, Health/utilization"’))
Best Regards
Hugh Williams
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> On 22 Feb 2016, at 22:36, Davis, Daniel (NIH/NLM) [C] <daniel.da...@nih.gov>
> wrote:
>
> Is there a way to make FILTER(REGEX(?label, ‘Insurance, Health/utilization’,
> ‘I’)) queries fast?
>
> I can see that REGEX is going to require a linear scan of the data, and that
> there are stored functions that do the matching.
>
> Will STRSTARTS be able to work quickly? Does the database collation allow
> case insensitive matching with STRSTARTS?
>
> Does one require a license for Virtuoso to use Full-text bif:contains (which
> is not quite the same as REGEX, of course)?
>
> Dan Davis, Systems/Applications Architect (Contractor),
> Office of Computer and Communications Systems,
> National Library of Medicine, NIH
>
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