substringWithRange get Range or index out of bounds error

Question

First is the code

// It's a test string 
NSString* aString =
    @",{id:\"bd\",name:\"ac\",latlng {lat:37.492488999999999,lng:127.014357}}";
// NSString *strRegex = @"latlng:\\ \\{(\\S*?)[^}]*\\}";
NSString *strRegex = @"latlng:\\{(\\S*?)[^}]*\\}";
NSRegularExpression* regEx = [NSRegularExpression
                                          regularExpressionWithPattern:strRegex
                                                               options:0
                                                                 error:NULL];
NSArray* matches = [regEx matchesInString:dataString
                                  options:0 
                                    range:NSMakeRange(0,[dataString length])];
NSInteger num=0;
for(NSTextCheckingResult* i in matches) {
    NSRange range = i.range;
    NSUInteger index = range.location; //the index you were looking for!
    //do something here
    num++;
    NSLog(@"%i",num);
    NSLog(@"index: %d",range.location);
    NSLog(@"length: %d", range.length);
    NSLog(@"%@",[aString substringWithRange:range]);
}

When use the test string, it goes well.

My problem is when I use a string from data (its size is about 50k), it turns to the error...

edited in 2012/07/19

Below is the string occurs error

NSError *error = nil;

NSString *urlString = [NSString stringWithFormat:@"http://maps.google.co.kr?q=%@&output=json", [address stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
//#define NSKoreanEncoding 0x80000422
NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:urlString]
                                     options:kNilOptions
                                       error:&error];
NSString *dataString = [[NSString alloc] initWithData:data
                                             encoding:NSKoreanEncoding];

It can match 10 results.

And when running the substringWithRange:range line it crashes.

Below is the error log.

2012-07-19 13:31:08.792 testView[6514:11c03] index: 649
2012-07-19 13:31:08.793 testView[6514:11c03] length: 46
2012-07-19 13:31:08.793 testView[6514:11c03] *** WebKit discarded an uncaught exception in the webView:shouldInsertText:replacingDOMRange:givenAction: delegate: <NSRangeException> -[__NSCFConstantString substringWithRange:]: Range or index out of bounds

score 1 · Accepted Answer · answered Jul 19 '12 at 05:02

1

You aren't checking that you actually got a valid range. From the class docs:

The range {NSNotFound, 0} is returned if one of the capture groups did not participate in this particular match.

You need to test for this condition in your code before just using the range in, e.g., substringWithRange:.

answered Jul 19 '12 at 05:02

Conrad Shultz

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I can got the right range values.Only turns to error on the `substringWithRange` line.I tested with two kinds of string.One is a samller, it has no error.The other one is a big string, it turns to error on the `substringWithRange` line – Steven Jiang Jul 19 '12 at 05:41
@StevenJiang I don't see how that's possible. Can you post the output of `[aString length]` and the offending `range`? – Conrad Shultz Jul 19 '12 at 05:46
I found the problem...I made a fool mistake...Using the range from `dataString` on `aString`... Thanks for your help~~ ^-^ – Steven Jiang Jul 19 '12 at 07:41

substringWithRange get Range or index out of bounds error

1 Answers1