iPhone : How to check whether a substring exists in a string?

I have some string开发者_如何学Go name and I want to compare whether that string contains substring like "_thumb.png".

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[string rangeOfString:string1].location!=NSNotFound

rangeOfString: documentation.

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You can try this:

NSString *originalString;
NSString *compareString;

Let your string be stored in originalString and the substring that you want to compare is stored in compareString.

if ([originalString rangeOfString:compareString].location==NSNotFound)
{       
    NSLog(@"Substring Not Found");  
}
else
{
    NSLog(@"Substring Found Successfully");
}

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ssteinberg's answer looks pretty good, but there is also this:

NSRange textRange;
textRange =[string rangeOfString:substring];

if(textRange.location != NSNotFound)
{

//Does contain the substring
}

which I found here.

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NSString *string = @"hello bla bla";
if ([string rangeOfString:@"bla"].location == NSNotFound)
{
    NSLog(@"string does not contain bla");
}  
else 
{
    NSLog(@"string contains bla!");
}

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In ios 8 or OS X 10.10 we can use.

if(![textLine containsString:@"abc"])
{
     [usableLines addObject:textLine];
}

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u can go through this

http://objcolumnist.com/2009/04/12/does-a-nsstring-contain-a-substring/