iOS中的Regex[轉]

標籤：

1. 下面一個簡單的使用Regex的一個例子：NSRegularExpression 類

-(void)parseString{

//組裝一個字串，需要把裡面的網址解析出來

NSString *[email protected]"sfdsfhttp://www.baidu.com";

 

//NSRegularExpression類裡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]* 這個運算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:urlStringoptions:0range:NSMakeRange(0, [urlString length])];

   if (firstMatch) {

      NSRange resultRange = [firstMatch rangeAtIndex:0]; //等同於 firstMatch.range --- 相匹配的範圍

      //從urlString當中截取資料

   NSString *result=[urlString substringWithRange:resultRange];

   //輸出結果

   NSLog(@"%@",result);

   }

  

   }

}

 

2.使用Regex來判斷

//初始化一個NSRegularExpression 對象，並設定檢測物件範圍為：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Regex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。謂詞是指在電腦中表示計算真假值的函數。原理和用法都類似於SQL查詢中的where，作用相當於資料庫的過濾取。主要用於從集合中分揀出合格對象，也可以用於字串的正則匹配

 

-(BOOL)isValidateEmail:(NSString *)email

{

    NSString *emailRegex = @"[A-Z0-9a-z._%+-][email protected][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/數字組成的字串的Regex：

    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，原理類似於在資料庫中進行查詢

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裡面迴圈比較  
    predicate = [NSPredicate predicateWithFormat: @"engine.horsepower > 150"]; 
    NSArray *cars = [garage cars]; 
    for (Car *car in [garage cars]) { 
        if ([predicate evaluateWithObject: car]) { 
            NSLog (@"%@", car.name); 
        } 
    } 
//輸出完整的資訊  
    predicate = [NSPredicate predicateWithFormat: @"engine.horsepower > 150"]; 
    NSArray *results; 
    results = [cars filteredArrayUsingPredicate: predicate]; 
    NSLog (@"%@", results); 
//含有變數的謂詞  
    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  
//謂詞字元竄還支援c語言中一些常用的運算子  
    
    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"]); 
//強大的數組運算子  
    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運算子  
    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];//這裡限制了SELF的範圍  
    NSLog (@"%@", results); 
//BEGINSWITH,ENDSWITH,CONTAINS  
//附加符號，[c],[d],[cd],c表示不區分大小寫，d表示不區分發音字元，cd表示什麼都不區分  
    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運算子（萬用字元）  
    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裡面迴圈比較
    predicate = [NSPredicate predicateWithFormat: @"engine.horsepower > 150"];
    NSArray *cars = [garage cars];
    for (Car *car in [garage cars]) {
        if ([predicate evaluateWithObject: car]) {
            NSLog (@"%@", car.name);
        }
    }
//輸出完整的資訊
    predicate = [NSPredicate predicateWithFormat: @"engine.horsepower > 150"];
    NSArray *results;
    results = [cars filteredArrayUsingPredicate: predicate];
    NSLog (@"%@", results);
//含有變數的謂詞
    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
//謂詞字元竄還支援c語言中一些常用的運算子
  
    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"]);
//強大的數組運算子
    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運算子
    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];//這裡限制了SELF的範圍
    NSLog (@"%@", results);
//BEGINSWITH,ENDSWITH,CONTAINS
//附加符號，[c],[d],[cd],c表示不區分大小寫，d表示不區分發音字元，cd表示什麼都不區分
    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運算子（萬用字元）
    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);

 

iOS中的Regex[轉]