Ios Extract data using regex from string

Question

i have

NSString *str =  @"<0x112233><0x112233><0x112233>0a";

i want this data to be saved in nsarray

nsarray  : { 0x112233 0x112233 0x112233 }

only save data which is enclosed in "<>" and ignore all other.

i tried regex like this

NSString *str =  @"<0x112233><0x112233><0x112233>0a";

NSError *error2;
NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"<(.*)>"
                                                                       options:NSRegularExpressionCaseInsensitive
                                                                         error:&error2];
if (error2)
{
    NSLog(@"Error %@", [error2 description]);
}

NSArray *payloadRanges=[regex matchesInString:str options:0 range:NSMakeRange(0, [str length])];


NSLog(@"data %@",payloadRanges);

but i gives me this output:

data (
    "<NSSimpleRegularExpressionCheckingResult: 0x1ddc5e30>{0, 30}{<NSRegularExpression: 0x1f078710> <(.*)> 0x1}"
)

"Extract data using regex from string" - please don't. Use NSScanner or something sane. No regexes for this. — user529758
– user529758, Commented Oct 26, 2013 at 11:06
You may wish to make your regular expression non-greedy and ignore the angle brackets - try: (?<=<)(.*?)(?=>) — Code Monkey
– Code Monkey, Commented Oct 26, 2013 at 11:13
[str stringByReplacingOccurrencesOfString:@"<" withString:@" "]]; — Kumar KL
– Kumar KL, Commented Oct 26, 2013 at 11:13

Martin R · Accepted Answer · 2013-10-26 11:39:11Z

(As Pat Teen said in a comment), your pattern is greedy, which means that the first match gets as much as possible, which is the entire string.

You can fix that by changing the pattern @"<(.*)>" to @"<(.*?)>".

Then payloadRanges is an array of three NSTextCheckingResult objects:

(
    "<NSSimpleRegularExpressionCheckingResult: 0x10010af40>{0, 10}{<NSRegularExpression: 0x100108960> <(.*?)> 0x1}",
    "<NSSimpleRegularExpressionCheckingResult: 0x10010c210>{10, 10}{<NSRegularExpression: 0x100108960> <(.*?)> 0x1}",
    "<NSSimpleRegularExpressionCheckingResult: 0x10010c250>{20, 10}{<NSRegularExpression: 0x100108960> <(.*?)> 0x1}"
)

Now you have to extract the substring matching the (...) group from each result:

NSMutableArray *data = [NSMutableArray array];
for (NSTextCheckingResult *result in payloadRanges) {
    [data addObject:[str substringWithRange:[result rangeAtIndex:1]]];
}
NSLog(@"data %@",data);

Output:

data (
    0x112233,
    0x112233,
    0x112233
)

Kumar KL · Accepted Answer · 2013-10-26 11:46:51Z

1

Cool , Try this simple line of manually hardcoded without using of any reg exper.:

NSString *convert =[str stringByReplacingOccurrencesOfString:@"<" withString:@""];

    convert= [convert stringByReplacingOccurrencesOfString:@">" withString:@" "];
    NSLog(@"con %@",convert);
    NSMutableArray *array = (NSMutableArray *)[convert componentsSeparatedByString:@" "];
    NSLog(@"%@" ,array);

    for(NSString *str in array){
        if([str length]<4){
            [array removeObject:str];
        }

    }
    NSLog(@"%@",array);

edited Oct 26, 2013 at 11:46

answered Oct 26, 2013 at 11:26

Kumar KL

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6 Comments

Kumar KL Over a year ago

put the loop for the array . and check for every object of it has minimum length if not just remove the object from the array.

ShujatAli Over a year ago

( "", 0x112233, "", 0x112233, "", 0x112233, 0a ) and some empty strings also

ShujatAli Over a year ago

con 0x112233 0x112233 0x1122330a 2013-10-26 16:35:48.896 GCDtest1[729:907] ( "", 0x112233, 0x112233, 0x1122330a ) no no 0a should be ignored

ShujatAli Over a year ago

currently 0a is at last position but it can be anywhere in string

Kumar KL Over a year ago

0x112233, whatever you want that should be the legnth arround 8 .. right

|

Hussain Shabbir · Accepted Answer · 2013-10-26 11:21:08Z

0

Try this:-

NSString *str =  @"<0x112233><0x112233><0x112233>0a";
NSArray *arr = [str componentsSeparatedByString:@"<"];

    NSString *str1 = [arr lastObject];

    NSArray *arr1 = [str1 componentsSeparatedByString:@">"];

    NSLog(@"array is %@",arr1);

    NSString *str2 = [[arr1 objectAtIndex:0] substringFromIndex:1];

NSString *str3=[str2 stringByReplacingOccurrencesOfString:@"0a" withString:@""];
NSLog(@"str3 is %@",str3);
[yourArray addObject:str3];

answered Oct 26, 2013 at 11:21

Hussain Shabbir

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Comments

Ron Rosenfeld · Accepted Answer · 2013-10-26 12:46:37Z

0

Just another regex that should work with your requirements:

<([^>]*)>

answered Oct 26, 2013 at 12:46

Ron Rosenfeld

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