原文：http://www.2cto.com/kf/201208/150608.html

参考：http://blog.csdn.net/iscape/article/details/7318021

参考：http://blog.csdn.net/zhulei1018/article/details/6777220

首先举一个例子： 匹配9-15个由字母/数字组成的字符串的正则表达式：     NSString * regex = @"^[A-Za-z0-9]{9,15}$";     NSPredicate *pred = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", regex];     BOOL isMatch = [pred evaluateWithObject:txtfldPhoneNumber.text];

Cocoa用NSPredicate描述查询的方式，原理类似于在数据库中进行查询

用BETWEEN，IN，BEGINWITH，ENDWITH，CONTAINS，LIKE这些谓词来构造NSPredicate，必要的时候使用SELF直接对自己进行匹配

//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', 'Snugs', 'Badger', 'Flap' }"];      results = [cars filteredArrayUsingPredicate: predicate];      NSLog (@"%@", [results valueForKey: @"name"]);           names = [cars valueForKey: @"name"];      predicate = [NSPredicate predicateWithFormat: @"SELF IN { 'Herbie', 'Snugs', 'Badger', '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); 

//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', 'Snugs', 'Badger', 'Flap' }"];     results = [cars filteredArrayUsingPredicate: predicate];     NSLog (@"%@", [results valueForKey: @"name"]);        names = [cars valueForKey: @"name"];     predicate = [NSPredicate predicateWithFormat: @"SELF IN { 'Herbie', 'Snugs', 'Badger', '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);