Predicate,又一次看到了。从c＋＋转过来的时候就开始关注它是否支持c＋＋的STL和predicate。看到都是支持的。谁让他们都是C的超集呢。

可以参照：

http://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/Predicates/Articles/pUsing.html#//apple_ref/doc/uid/TP40001794

 

 

演示下代码。

    NSMutableArray *array =         [NSMutableArray arrayWithObjects:@"Miguel", @"Ben", @"Adam", @"Melissa", nil];                 NSPredicate *bPredicate = [NSPredicate predicateWithFormat:@"SELF beginswith[c] 'a'"];         NSArray *beginWithB = [array filteredArrayUsingPredicate:bPredicate];         // beginWithB contains { @"Adam" }.                 NSPredicate *sPredicate = [NSPredicate predicateWithFormat:@"SELF contains[c] 'e'"];         [array filterUsingPredicate:sPredicate];            NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF IN %@",                                                             [NSArray arrayWithObjects:@"Stig", @"Shaffiq", @"Chris", nil]];         BOOL result = [predicate evaluateWithObject:@"Shaffiq"];

 

 

关于正泽表达式可以参照类

NSRegularExpression Class Reference

：http://developer.apple.com/library/ios/#documentation/Foundation/Reference/NSRegularExpression_Class/Reference/Reference.html