Apples documentation of Regular Expressions With NSPredicate has the full scoop, but basically you do
[NSPredicate predicateWithFormat:@"SELF MATCHES regex-here"];. Unfortunately, you can only test if strings match a regex. You can not use an NSPredicate-regex to extract parts of a string. Depending on what you need to do, this may or may not be enough to save the day.
September 20, 2008
Regex Matching and Filtering in Cocoa With NSPredicate
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