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I'm trying to check if an NSString contains a substring. It's not working however as there is no space between the words in the string. e.g. I need to find out if 'hello' exists in this string:

@"test.hello"

NSString containsString does not find it. Any other solutions?

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  • Unless Apple has done something weird with that interface [@"test.hello" containsString:@"hello"] should return YES. Commented Dec 2, 2014 at 16:52
  • @HotLicks I thought so but it wasn't working for me. I've accepted the working answer. Commented Dec 2, 2014 at 17:07

2 Answers 2

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iOS 8 has a new method, localizedCaseInsensitiveContainsString: also, in addition to containsString:. 

NSString *testString = @"test.hello";
BOOL found = [testString localizedCaseInsensitiveContainsString:@"Hello"];
NSLog(@"%@", found ? @"Yes":@"No"); // prints Yes
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8 Comments

Good to know thanks! That was only part of the problem though. I had to separate the string into components as the containsString methods search for parts of a string, they won't pick out a string within a string (e.g. they can't get 'boo' from 'aaabooaaa').
@kmcgrady, this method will return YES for the example you gave (finding boo in 'aaabooaaa'). Are you saying that it won't do that?
Apologies, didn't think it would work but I just tested it and it does. Much more compact than my solution too. Thanks!
@kmcgrady, do you see either of theses methods in your Xcode documentation? I only found them with a search on SO.
@rdelmar - They are not in the online documentation, and, worse, if you search for them you're apt to find some 3rd-party categories by the same name.
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Update

This works but @rdelmar's answer is much more compact.

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I discovered an answer elsewhere on SO. Basically I had to use NSRange and check via the following method:

[string rangeOfString:@"hello" options:NSCaseInsensitiveSearch].location != NSNotFound

I also had to split my string before doing the check. So in the example words are separated by a period. I called:

NSArray *myArray = [string componentsSeparatedByCharactersInSet:[NSCharacterSet characterSetWithCharactersInString:@"."]];

and the looped through that array of strings doing the rangeOfString search. I set a BOOL so that once my string 'hello' was found it stopped searching.

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