IOS用正規表達式驗證textfield輸入的内容是否合法

iphone 4.0以後就開始支援正規表達式的使用了，在ios4.0中正規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規表達式的一個例子：NSRegularExpression 類

-(void)parseString{

//組裝一個字元串，需要把裡面的網址解析出來

NSString *urlString=@"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 --- 相比對的範圍

//從urlString當中截取資料

NSString *result=[urlString substringWithRange:resultRange];

//輸出結果

NSLog(@"%@",result);

}

2.使用正規表達式來判斷

//初始化一個NSRegularExpression 對象，并設定檢測對象範圍為：0-9

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

if (regex2)

{//對象進行比對

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确的代碼：NSPredicatel類

//利用正規表達式驗證

NSPredicatel類:主要用來指定過濾器的條件,該對象可以準确的描述所需條件，對每個對象通過謂詞進行篩選，判斷是否與條件相比對。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，作用相當于資料庫的過濾取。主要用于從集合中分揀出符合條件的對象，也可以用于字元串的正則比對

-(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 。比對9-15個由字母/數字組成的字元串的正規表達式：

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直接對自己進行比對

[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);

}

//輸出完整的資訊

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

predicate = [NSPredicate predicateWithFormat:

@"(engine.horsepower > 50) AND (engine.horsepower < 200)"];

NSLog (@"oop %@", results);

predicate = [NSPredicate predicateWithFormat: @"name < 'Newton'"];

NSLog (@"%@", [results valueForKey: @"name"]);

//強大的數組運算符

@"engine.horsepower BETWEEN { 50, 200 }"];

NSArray *betweens = [NSArray arrayWithObjects:

[NSNumber numberWithInt: 50], [NSNumber numberWithInt: 200], nil];

predicate = [NSPredicate predicateWithFormat: @"engine.horsepower BETWEEN %@", betweens];

predicateTemplate = [NSPredicate predicateWithFormat: @"engine.horsepower BETWEEN $POWERS"];

varDict = [NSDictionary dictionaryWithObjectsAndKeys: betweens, @"POWERS", nil];

//IN運算符

predicate = [NSPredicate predicateWithFormat: @"name IN { 'Herbie', 'Snugs', 'Badger', 'Flap' }"];

predicate = [NSPredicate predicateWithFormat: @"SELF.name IN { 'Herbie', 'Snugs', 'Badger', 'Flap' }"];

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

//BEGINSWITH,ENDSWITH,CONTAINS

//附加符号，[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'"];

predicate = [NSPredicate predicateWithFormat: @"name BEGINSWITH 'HERB'"];

predicate = [NSPredicate predicateWithFormat: @"name BEGINSWITH[cd] 'HERB'"];

//LIKE運算符（通配符）

predicate = [NSPredicate predicateWithFormat: @"name LIKE[cd] '*er*'"];

predicate = [NSPredicate predicateWithFormat: @"name LIKE[cd] '???er*'"];

//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);

}

//輸出完整的資訊

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

//謂詞字元竄還支援c語言中一些常用的運算符

predicate = [NSPredicate predicateWithFormat:

@"(engine.horsepower > 50) AND (engine.horsepower < 200)"];

NSLog (@"oop %@", results);

predicate = [NSPredicate predicateWithFormat: @"name < 'Newton'"];

NSLog (@"%@", [results valueForKey: @"name"]);

//強大的數組運算符

@"engine.horsepower BETWEEN { 50, 200 }"];

NSArray *betweens = [NSArray arrayWithObjects:

[NSNumber numberWithInt: 50], [NSNumber numberWithInt: 200], nil];

predicate = [NSPredicate predicateWithFormat: @"engine.horsepower BETWEEN %@", betweens];

predicateTemplate = [NSPredicate predicateWithFormat: @"engine.horsepower BETWEEN $POWERS"];

varDict = [NSDictionary dictionaryWithObjectsAndKeys: betweens, @"POWERS", nil];

//IN運算符

predicate = [NSPredicate predicateWithFormat: @"name IN { 'Herbie', 'Snugs', 'Badger', 'Flap' }"];

predicate = [NSPredicate predicateWithFormat: @"SELF.name IN { 'Herbie', 'Snugs', 'Badger', 'Flap' }"];

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

//BEGINSWITH,ENDSWITH,CONTAINS

//附加符号，[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'"];

predicate = [NSPredicate predicateWithFormat: @"name BEGINSWITH 'HERB'"];

predicate = [NSPredicate predicateWithFormat: @"name BEGINSWITH[cd] 'HERB'"];

//LIKE運算符（通配符）

predicate = [NSPredicate predicateWithFormat: @"name LIKE[cd] '*er*'"];

predicate = [NSPredicate predicateWithFormat: @"name LIKE[cd] '???er*'"];

本文轉蓬萊仙羽51CTO部落格，原文連結：http://blog.51cto.com/dingxiaowei/1366430

，如需轉載請自行聯系原作者

IOS用正規表達式驗證textfield輸入的内容是否合法

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