正则表达式 NSPredicate 的完全用法

概述Cocoa用NSPredicate描述查询的方式，原理类似于在数据库中进行查询 计算谓词： //基本的查询 NSPredicate *predicate; predicate = [NSPredicate predicateWithFormat: @"name == 'Herbie'"];     BOOL match = [predicate evaluateWithObject: car]; Cocoa用nspredicate描述查询的方式，原理类似于在数据库中进行查询 计算谓词： //基本的查询 nspredicate *predicate; predicate = [nspredicate predicateWithFormat: @"name == 'HerbIE'"];     BOol match = [predicate evaluateWithObject: car];     NSLog (@"%s",(match) ? "YES" : "NO"); //在整个cars里面循环比较     predicate = [nspredicate predicateWithFormat: @"engine.horsepower > 150"];     NSArray *cars = [garage cars];     for (Car *car in [garage cars]) {         if ([predicate evaluateWithObject: car]) {             NSLog (@"%@",car.name);         }     } //输出完整的信息     predicate = [nspredicate predicateWithFormat: @"engine.horsepower > 150"];     NSArray *results;     results = [cars filteredArrayUsingPredicate: predicate];     NSLog (@"%@",results); //含有变量的谓词     nspredicate *predicateTemplate = [nspredicate predicateWithFormat:@"name == $name"];     NSDictionary *varDict;     varDict = [NSDictionary dictionaryWithObjectsAndKeys:                @"HerbIE",@"name",nil];     predicate = [predicateTemplate predicateWithSubstitutionVariables: varDict];     NSLog(@"SnorGLE: %@",predicate);     match = [predicate evaluateWithObject: car];   NSLog (@"%s",(match) ? "YES" : "NO"); //注意不能使用$VARIABLE作为路径名，因为它值代表值 //谓词字符窜还支持c语言中一些常用的运算符         predicate = [nspredicate predicateWithFormat:                  @"(engine.horsepower > 50) AND (engine.horsepower < 200)"];     results = [cars filteredArrayUsingPredicate: predicate];     NSLog (@"oop %@",results);         predicate = [nspredicate predicateWithFormat: @"name < 'Newton'"];     results = [cars filteredArrayUsingPredicate: predicate];     NSLog (@"%@",[results valueForKey: @"name"]); //强大的数组运算符     predicate = [nspredicate predicateWithFormat:                  @"engine.horsepower BETWEEN { 50,200 }"];     results = [cars filteredArrayUsingPredicate: predicate];     NSLog (@"%@",results);         NSArray *betweens = [NSArray arrayWithObjects:                          [NSNumber numberWithInt: 50],[NSNumber numberWithInt: 200],nil];     predicate = [nspredicate predicateWithFormat: @"engine.horsepower BETWEEN %@",betweens];     results = [cars filteredArrayUsingPredicate: predicate];     NSLog (@"%@",results);     predicateTemplate = [nspredicate predicateWithFormat: @"engine.horsepower BETWEEN $POWERS"];     varDict = [NSDictionary dictionaryWithObjectsAndKeys: betweens,@"POWERS",nil];     predicate = [predicateTemplate predicateWithSubstitutionVariables: varDict];     results = [cars filteredArrayUsingPredicate: predicate];     NSLog (@"%@",results); //IN运算符     predicate = [nspredicate predicateWithFormat: @"name IN { 'HerbIE','Snugs','Badger','Flap' }"];     results = [cars filteredArrayUsingPredicate: predicate];     NSLog (@"%@",[results valueForKey: @"name"]);     predicate = [nspredicate predicateWithFormat: @"SELF.name IN { 'HerbIE',[results valueForKey: @"name"]);         names = [cars valueForKey: @"name"];     predicate = [nspredicate predicateWithFormat: @"SELF IN { 'HerbIE','Flap' }"];     results = [names filteredArrayUsingPredicate: predicate];//这里限制了SELF的范围     NSLog (@"%@",results); //BEGINSWITH,ENDSWITH,CONTAINS //附加符号，[c],[d],[cd],c表示不区分大小写，d表示不区分发音字符，cd表示什么都不区分     predicate = [nspredicate predicateWithFormat: @"name BEGINSWITH 'Bad'"];     results = [cars filteredArrayUsingPredicate: predicate];     NSLog (@"%@",results);         predicate = [nspredicate predicateWithFormat: @"name BEGINSWITH 'HERB'"];     results = [cars filteredArrayUsingPredicate: predicate];     NSLog (@"%@",results);         predicate = [nspredicate predicateWithFormat: @"name BEGINSWITH[cd] 'HERB'"];     results = [cars filteredArrayUsingPredicate: predicate];     NSLog (@"%@",results); //liKE运算符（通配符）     predicate = [nspredicate predicateWithFormat: @"name liKE[cd] '*er*'"];     results = [cars filteredArrayUsingPredicate: predicate];     NSLog (@"%@",results);         predicate = [nspredicate predicateWithFormat: @"name liKE[cd] '???er*'"];     results = [cars filteredArrayUsingPredicate: predicate];     NSLog (@"%@",results); 总结

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