<转>代码判断邮箱是否合法

原文：http://blog.csdn.net/favormm/article/details/6573318

 

 1 -(BOOL)validateEmail:(NSString*)email{  
 2       
 3     if( (0 != [email rangeOfString:@"@"].length) &&  (0 != [email rangeOfString:@"."].length) )  
 4     {  
 5         NSMutableCharacterSet *invalidCharSet = [[[[NSCharacterSet alphanumericCharacterSet] invertedSet]mutableCopy]autorelease];  
 6         [invalidCharSet removeCharactersInString:@"_-"];  
 7           
 8         NSRange range1 = [email rangeOfString:@"@" options:NSCaseInsensitiveSearch];  
 9           
10         // If username part contains any character other than "."  "_" "-"  
11           
12         NSString *usernamePart = [email substringToIndex:range1.location];  
13         NSArray *stringsArray1 = [usernamePart componentsSeparatedByString:@"."];  
14         for (NSString *string in stringsArray1) {  
15             NSRange rangeOfInavlidChars=[string rangeOfCharacterFromSet: invalidCharSet];  
16             if(rangeOfInavlidChars.length !=0 || [string isEqualToString:@""])  
17                 return NO;  
18         }  
19           
20         NSString *domainPart = [email substringFromIndex:range1.location+1];  
21         NSArray *stringsArray2 = [domainPart componentsSeparatedByString:@"."];  
22           
23         for (NSString *string in stringsArray2) {  
24             NSRange rangeOfInavlidChars=[string rangeOfCharacterFromSet:invalidCharSet];  
25             if(rangeOfInavlidChars.length !=0 || [string isEqualToString:@""])  
26                 return NO;  
27         }  
28           
29         return YES;  
30     }  
31     else // no '@' or '.' present  
32         return NO;  
33 }