how to match string portion with NSArray values in objective-c

Question

I have following array and search string.

NSArray *values =[NSArray arrayWithObjects:@"abc",@"xyz",@"cba",@"yzx",nil];

NSString *search = @"startcba";

I want to search string's end part within an array elements. My expected search result will be @"cba". Please let me know how to find the desire value in array for giving search.

Thanks,

always the three last characters ? If so, get the substring and send [myArray indexOfObject:myString]. — user756245
– user756245, Commented Jul 22, 2011 at 12:06
Sorry, it can be of any length, like : NSArray *values =[NSArray arrayWithObjects:@"abc",@"xyz",@"cba",@"yzx",@"Abcd",nil]; NSString *search = @"startabcd"; — AmitSri
– AmitSri, Commented Jul 23, 2011 at 6:17

Deepak Danduprolu · Accepted Answer · 2011-07-22 12:18:34Z

4

You can use NSPredicate to get the elements that satisfy your requirement.

NSPredicate * predicate = [NSPredicate predicateWithFormat:@" %@ ENDSWITH SELF ", search];
NSArray * searchResults = [values filteredArrayUsingPredicate:predicate];

answered Jul 22, 2011 at 12:18

Deepak Danduprolu

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2 Comments

EmptyStack Over a year ago

You can specify c and d in the predicate for case and diacritic insensitivity. So, predicate format looks like this @" %@ ENDSWITH[cd] SELF "

AmitSri Over a year ago

Thanks Deepak and EmptyStack for providing easy and exact solution.

Monolo · Accepted Answer · 2011-07-22 12:34:22Z

1

The NSPredicates way is great.

Here is an approach with rangeOfString:

NSArray *values =[NSArray arrayWithObjects:@"abc",@"xyz",@"cba",@"yzx",nil];

NSString *search = @"startcba";
NSUInteger searchLength = [search length];
NSString *result = nil;

for (NSString *val in values)
{
    NSUInteger valLength = [val length];
    NSRange expectedRange = NSMakeRange(searchLength - valLength, valLength);
    NSRange rng = [search rangeOfString:val];

    if ( rng.location == expectedRange.location && rng.length == expectedRange.length )
    {
        result = val;
        break;
    }
}

answered Jul 22, 2011 at 12:34

Monolo

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1 Comment

AmitSri Over a year ago

Thanks, for your rangeOfString approach is equally good like deepak's and it can also allow me to find the index of items in the same loop. Sorry, i have to accept deepak's answer as it is exactly what i needed. I appreciate your valuable help.

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