iOS App開發中Objective-C使用Regex進行匹配的方法_IOS

iOS中有三種方式來實現Regex的匹配。現在將他們都記錄在這裡：

1.利用NSPredicate（謂詞）匹配
例如匹配有效郵箱：

NSString ＊email ＝ @“nijino_saki@163.com”； NSString *regex = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}"; NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", regex]; BOOL isValid = [predicate evaluateWithObject:email];

謂詞匹配比較靈活，但是需要有謂詞的相關知識。

2.利用rangeOfString：option：直接尋找

NSString *searchText = @"// Do any additional setup after loading the view, typically from a nib.";  NSRange range = [searchText rangeOfString:@"(?:[^,])*\\." options:NSRegularExpressionSearch];  if (range.location != NSNotFound) {   NSLog(@"%@", [searchText substringWithRange:range]); }

options中設定NSRegularExpressionSearch就是表示利用Regex匹配，會返回第一個匹配結果的位置。

3.使用Regex類

NSString *searchText = @"// Do any additional setup after loading the view, typically from a nib.";  NSError *error = NULL;NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"(?:[^,])*\\." options:NSRegularExpressionCaseInsensitive error:&error];NSTextCheckingResult *result = [regex firstMatchInString:searchText options:0 range:NSMakeRange(0, [searchText length])];if (result) {  NSLog(@"%@\n", [searchText substringWithRange:result.range]);}

使用系統的Regex類（NSRegularExpression）會返回匹配的多個結果。

執行個體：
1.驗證郵箱

+ (BOOL)validateEmail:(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];}

NSPredicate是一個Foundation類，是用來查詢的，原理和用法都類似於SQL中的where。

2.驗證手機號

簡單的判斷方法

+ (BOOL)validatePhone:(NSString *)phone{  NSString *phoneRegex = @"1[3|5|7|8|][0-9]{9}";  NSPredicate *phoneTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", phoneRegex];  return [phoneTest evaluateWithObject:phone];}

這隻是簡單地判斷手機號格式。其實手機的格式還是有一點複雜的。

詳細的判斷方法

//正則判斷手機號碼格式+ (BOOL)validatePhone:(NSString *)phone{    /**    * 手機號碼    * 移動：134[0-8],135,136,137,138,139,150,151,157,158,159,182,187,188    * 聯通：130,131,132,152,155,156,185,186    * 電信：133,1349,153,180,189    */    NSString * MOBILE = @"^1(3[0-9]|5[0-35-9]|8[025-9])\\d{8}$";    /**         * 中國移動：China Mobile         * 134[0-8],135,136,137,138,139,150,151,157,158,159,182,187,188         */    NSString * CM = @"^1(34[0-8]|(3[5-9]|5[017-9]|8[278])\\d)\\d{7}$";    /**         * 中國聯通：China Unicom         * 130,131,132,152,155,156,185,186         */    NSString * CU = @"^1(3[0-2]|5[256]|8[56])\\d{8}$";    /**         * 中國電信：China Telecom         * 133,1349,153,180,189         */    NSString * CT = @"^1((33|53|8[09])[0-9]|349)\\d{7}$";    /**         * 大陸地區固話及小靈通         * 區號：010,020,021,022,023,024,025,027,028,029         * 號碼：七位或八位         */   // NSString * PHS = @"^0(10|2[0-5789]|\\d{3})\\d{7,8}$";   NSPredicate *regextestmobile = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", MOBILE];   NSPredicate *regextestcm = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CM];   NSPredicate *regextestcu = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CU];   NSPredicate *regextestct = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CT];  if (([regextestmobile evaluateWithObject:phone] == YES)  || ([regextestcm evaluateWithObject:phone] == YES)  || ([regextestct evaluateWithObject:phone] == YES)  || ([regextestcu evaluateWithObject:phone] == YES))  {    if([regextestcm evaluateWithObject:phone] == YES) {     NSLog(@"China Mobile");    } else if([regextestct evaluateWithObject:phone] == YES) {     NSLog(@"China Telecom");    } else if ([regextestcu evaluateWithObject:phone] == YES) {     NSLog(@"China Unicom");    } else {     NSLog(@"Unknow");    }    return YES;  }  else   {    return NO;  }}