iPhone:How to fetch special characters from an array - iphone

Question

Suppose I have an array as follows:
shuffleArray = [[NSMutableArray alloc] initWithObjects:#"H",#"$",#"E",#"*",#"L",#"L",#"O", nil];
I want to fetch only special characters from this array
and in addition after fetching them I want to remove these special characters from array
How can I do it?
Any Help will be appreciable.
Thanx in advance...

Answer 1

Try this out,
NSMutableArray *shuffleArray = [[NSMutableArray alloc] initWithObjects:#"H",#"$",#"E",#"*",#"L",#"L",#"O", nil];
NSLog(#"Letters Array%#",[shuffleArray filteredArrayUsingPredicate:[NSPredicate predicateWithBlock:^BOOL(NSString *evaluatedString, NSDictionary *bindings) {
return [[evaluatedString stringByTrimmingCharactersInSet:[NSCharacterSet letterCharacterSet]] length]==0;
}]]);
NSLog(#"Special Characters Array%#",[shuffleArray filteredArrayUsingPredicate:[NSPredicate predicateWithBlock:^BOOL(NSString *evaluatedString, NSDictionary *bindings) {
return [[evaluatedString stringByTrimmingCharactersInSet:[NSCharacterSet letterCharacterSet]] length]!=0;
}]]);

Answer 2

NSMutableArray *shuffleArray = [[NSMutableArray alloc] initWithObjects:#"H",#"$",#"E",#"*",#"L",#"L",#"O", nil];
for(int i=0; i<[shuffleArray count];i++)
{
unichar c = [[shuffleArray objectAtIndex:i] characterAtIndex:0];
if (![[NSCharacterSet alphanumericCharacterSet] characterIsMember:c])
{
NSLog(#"%c",c);
[shuffleArray removeObjectAtIndex:i];
i--;
}
}
tried this and it works. hope it helps. happy coding :)

Answer 3

You use a NSPredicate for that:
Example:
NSPredicate *predicate = [NSPredicate predicateWithFormat:#"memberNumber == %#", [NSNumber numberWithInt:memberNumber]];
NSArray *matchingMembers = [members filteredArrayUsingPredicate:predicate];
Customer *customer = [matchingMembers lastObject];
NSLog(#"%#", customer.name);
Here is the documentation link at Apple.
Here is another explanation

Answer 4

You need regex that matches special characters, this link may help you.
your regex is somthing like this "[^[A-Za-z][0-9]]"
How to get matches in iOS using regular expression?