判断邮箱是否合法
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-(BOOL)validateEmail:(NSString*)email{ if((0 != [email rangeOfString:@"@"].length) && (0 != [email rangeOfString:@"."].length)) { NSCharacterSet* tmpInvalidCharSet = [[NSCharacterSet alphanumericCharacterSet] invertedSet]; NSMutableCharacterSet* tmpInvalidMutableCharSet = [[tmpInvalidCharSet mutableCopy] autorelease]; [tmpInvalidMutableCharSet removeCharactersInString:@"_-"]; //使用compare option 来设定比较规则,如 //NSCaseInsensitiveSearch是不区分大小写 //NSLiteralSearch 进行完全比较,区分大小写 //NSNumericSearch 只比较定符串的个数,而不比较字符串的字面值 NSRange range1 = [email rangeOfString:@"@" options:NSCaseInsensitiveSearch]; //取得用户名部分 NSString* userNameString = [email substringToIndex:range1.location]; NSArray* userNameArray = [userNameString componentsSeparatedByString:@"."]; for(NSString* string in userNameArray) { NSRange rangeOfInavlidChars = [string rangeOfCharacterFromSet: tmpInvalidMutableCharSet]; if(rangeOfInavlidChars.length != 0 || [string isEqualToString:@""]) return NO; } NSString *domainString = [email substringFromIndex:range1.location+1]; NSArray *domainArray = [domainString componentsSeparatedByString:@"."]; for(NSString *string in domainArray) { NSRange rangeOfInavlidChars=[string rangeOfCharacterFromSet:tmpInvalidMutableCharSet]; if(rangeOfInavlidChars.length !=0 || [string isEqualToString:@""]) return NO; } return YES; } else // no ''@'' or ''.'' present return NO;}
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