代码判断邮箱是否合法2

在前面的一段时间里介绍了如何代码判断邮箱是否合法

http://blog.youkuaiyun.com/favormm/archive/2011/06/19/6555350.aspx

今天又与大家分享一段代码，用来判断邮箱是否合法，原理就是字符串操作来检查。

-(BOOL)validateEmail:(NSString*)email{ if( (0 != [email rangeOfString:@"@"].length) && (0 != [email rangeOfString:@"."].length) ) { NSMutableCharacterSet *invalidCharSet = [[[[NSCharacterSet alphanumericCharacterSet] invertedSet]mutableCopy]autorelease]; [invalidCharSet removeCharactersInString:@"_-"]; NSRange range1 = [email rangeOfString:@"@" options:NSCaseInsensitiveSearch]; // If username part contains any character other than "." "_" "-" NSString *usernamePart = [email substringToIndex:range1.location]; NSArray *stringsArray1 = [usernamePart componentsSeparatedByString:@"."]; for (NSString *string in stringsArray1) { NSRange rangeOfInavlidChars=[string rangeOfCharacterFromSet: invalidCharSet]; if(rangeOfInavlidChars.length !=0 || [string isEqualToString:@""]) return NO; } NSString *domainPart = [email substringFromIndex:range1.location+1]; NSArray *stringsArray2 = [domainPart componentsSeparatedByString:@"."]; for (NSString *string in stringsArray2) { NSRange rangeOfInavlidChars=[string rangeOfCharacterFromSet:invalidCharSet]; if(rangeOfInavlidChars.length !=0 || [string isEqualToString:@""]) return NO; } return YES; } else // no '@' or '.' present return NO; }

代码收集于网上，如侵害了版权，请通知我，于予删除。