IOS用正則表達式驗證textfield輸入的內容是否合法

發布時間：2020-06-23 09:24:20 來源：網絡閱讀：298 作者：蓬萊仙羽欄目：移動開發

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。

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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