Comments on: NSPredicate and regular expressions http://www.losingfight.com/blog/2006/09/29/nspredicate-and-regular-expressions/ i saw that Sun, 12 Oct 2008 15:12:44 +0000 http://wordpress.org/?v=2.5 By: Melissa Turner http://www.losingfight.com/blog/2006/09/29/nspredicate-and-regular-expressions/#comment-761 Melissa Turner Fri, 03 Nov 2006 21:28:11 +0000 http://www.losingfight.com/blog/2006/09/29/nspredicate-and-regular-expressions/#comment-761 Regex isn't supported by the SQL standard, but SQLite allows you to register custom functions, and Core Data registers for LIKE and MATCHES to get the same matching behavior you see with NSPredicate. The performance characteristics of the matching logic are the same between the implementations, but you lose all the overhead of realizing objects so you can discard them. Regex isn’t supported by the SQL standard, but SQLite allows you to register custom functions, and Core Data registers for LIKE and MATCHES to get the same matching behavior you see with NSPredicate.

The performance characteristics of the matching logic are the same between the implementations, but you lose all the overhead of realizing objects so you can discard them.

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