objectivec谓词

oc的谓词跟正则表达式和sql很像&＃xff0c;没有新的语法&＃xff0c;可以看做oc单独整了一个类专门封装了正则表达式。 谓词关键字不区分大小写

&＃64;interface User : NSObject&＃64;property NSString*name;
&＃64;end&＃64;implementation User
&＃64;endint main(int argc, const char * argv[]) {&＃64;autoreleasepool {User* u&＃61;[User new];u.name&＃61;&＃64;"abcd";NSPredicate*p&＃61; [NSPredicate predicateWithFormat:&＃64;"name contains &＃39;a&＃39; "];BOOL b&＃61;[p evaluateWithObject:u];NSLog(&＃64;"%d",b);p&＃61; [NSPredicate predicateWithFormat:&＃64;"name like &＃39;a*&＃39; "];b&＃61;[p evaluateWithObject:u];NSLog(&＃64;"%d",b);p&＃61; [NSPredicate predicateWithFormat:&＃64;"%&＃64; contains &＃39;a&＃39; " , &＃64;"name"];b&＃61;[p evaluateWithObject:u];NSLog(&＃64;"%d",b);}
}

打印

2015-10-07 14:30:50.822 testt[1100:33725] 1
2015-10-07 14:30:50.827 testt[1100:33725] 1
2015-10-07 14:30:50.827 testt[1100:33725] 1