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IOS用正則表達式驗證textfield輸入的內容是否合法-創新互聯

iphone 4.0以后就開始支持正則表達式的使用了，在ios4.0中正則表達式的使用是使用NSRegularExpression類來調用。

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1. 下面一個簡單的使用正則表達式的一個例子：NSRegularExpression 類

-(void)parseString{

//組裝一個字符串，需要把里面的網址解析出來

NSString *urlString=@"sfdsfhttp://www.baidu.com";

//NSRegularExpression類里面調用表達的方法需要傳遞一個NSError的參數。下面定義一個

 NSError *error;

//http+:[^\\s]* 這個表達式是檢測一個網址的。

  NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"http+:[^\\s]*" options:0 error:&error];

   if (regex != nil) {

   NSTextCheckingResult *firstMatch=[regex firstMatchInString:urlString options:0range:NSMakeRange(0, [urlString length])];

   if (firstMatch) {

    NSRange resultRange = [firstMatch rangeAtIndex:0]; //等同于 firstMatch.range --- 相匹配的范圍

    //從urlString當中截取數據

   NSString *result=[urlString substringWithRange:resultRange];

   //輸出結果

   NSLog(@"%@",result);

  }

  }

}

2.使用正則表達式來判斷

//初始化一個NSRegularExpression 對象，并設置檢測對象范圍為：0-9

NSRegularExpression *regex2 = [NSRegularExpression regularExpressionWithPattern:@"^[0-9]*$" options:0 error:nil];

    if (regex2)

    {//對象進行匹配

       NSTextCheckingResult *result2 = [regex2 firstMatchInString:textField.text options:0 range:NSMakeRange(0, [textField.text length])];

      if (result2) {

      }

}

1。 判斷郵箱格式是否正確的代碼：NSPredicatel類

//利用正則表達式驗證

NSPredicatel類:主要用來指定過濾器的條件,該對象可以準確的描述所需條件，對每個對象通過謂詞進行篩選，判斷是否與條件相匹配。謂詞是指在計算機中表示計算真假值的函數。原理和用法都類似于SQL查詢中的where，作用相當于數據庫的過濾取。主要用于從集合中分揀出符合條件的對象，也可以用于字符串的正則匹配

-(BOOL)isValidateEmail:(NSString *)email

{

  NSString *emailRegex = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}";

  NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES%@",emailRegex];

  return [emailTest evaluateWithObject:email];

}

2 。 匹配9-15個由字母/數字組成的字符串的正則表達式：


   NSString * regex = @"^[A-Za-z0-9]{9,15}$";
   NSPredicate *pred = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", regex];
   BOOL isMatch = [pred evaluateWithObject:txtfldPhoneNumber.text];

Cocoa用NSPredicate描述查詢的方式，原理類似于在數據庫中進行查詢

用BETWEEN，IN，BEGINWITH，ENDWITH，CONTAINS，LIKE這些謂詞來構造NSPredicate，必要的時候使用SELF直接對自己進行匹配

[cpp]
//基本的查詢  
NSPredicate *predicate; 
predicate = [NSPredicate predicateWithFormat: @"name == 'Herbie'"]; 
   BOOL match = [predicate evaluateWithObject: car]; 
   NSLog (@"%s", (match) ? "YES" : "NO"); 
//在整個cars里面循環比較  
   predicate = [NSPredicate predicateWithFormat: @"engine.horsepower > 150"]; 
   NSArray *cars = [garage cars]; 
   for (Car *car in [garage cars]) { 
       if ([predicate evaluateWithObject: car]) { 
           NSLog (@"%@", car.name); 
       } 
   } 
//輸出完整的信息  
   predicate = [NSPredicate predicateWithFormat: @"engine.horsepower > 150"]; 
   NSArray *results; 
   results = [cars filteredArrayUsingPredicate: predicate]; 
   NSLog (@"%@", results); 
//含有變量的謂詞  
   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作為路徑名，因為它值代表值  
//謂詞字符竄還支持c語言中一些常用的運算符  
    
   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"]); 
//強大的數組運算符  
   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運算符  
   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];//這里限制了SELF的范圍  
   NSLog (@"%@", results); 
//BEGINSWITH,ENDSWITH,CONTAINS  
//附加符號，[c],[d],[cd],c表示不區分大小寫，d表示不區分發音字符，cd表示什么都不區分  
   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運算符（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);

//基本的查詢
NSPredicate *predicate;
predicate = [NSPredicate predicateWithFormat: @"name == 'Herbie'"];
   BOOL match = [predicate evaluateWithObject: car];
   NSLog (@"%s", (match) ? "YES" : "NO");
//在整個cars里面循環比較
   predicate = [NSPredicate predicateWithFormat: @"engine.horsepower > 150"];
   NSArray *cars = [garage cars];
   for (Car *car in [garage cars]) {
       if ([predicate evaluateWithObject: car]) {
           NSLog (@"%@", car.name);
       }
   }
//輸出完整的信息
   predicate = [NSPredicate predicateWithFormat: @"engine.horsepower > 150"];
   NSArray *results;
   results = [cars filteredArrayUsingPredicate: predicate];
   NSLog (@"%@", results);
//含有變量的謂詞
   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作為路徑名，因為它值代表值
//謂詞字符竄還支持c語言中一些常用的運算符
  
   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"]);
//強大的數組運算符
   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運算符
   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];//這里限制了SELF的范圍
   NSLog (@"%@", results);
//BEGINSWITH,ENDSWITH,CONTAINS
//附加符號，[c],[d],[cd],c表示不區分大小寫，d表示不區分發音字符，cd表示什么都不區分
   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運算符（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);

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