[basex-talk] Performance of matches() vs castable as xs:integer

Hello all, I'm scanning millions of XML records imported from CSV looking for instances of 'bib_rec_id' which are non-numeric. Which of these two is if-statements likely to complete earlier? for $a in (/csv/record/bib_rec_id) return if ($a castable as xs:integer) then ... blah or if (matches($a, '^[0-9]+$')) then ... blah Yes - I'm trying it out now, but I suspect it will be quicker to ask than wait for either query to complete. TIA. ________________________________ Elsevier B.V. Registered Office: Radarweg 29, 1043 NX Amsterdam, The Netherlands, Registration No. 33156677, Registered in The Netherlands.