scan string using nsscanner class

Question

I want to scan this string

"hello I am emp 1313 object of string class 123"

so in this I want to know if their are any integer value present and if present I want to display them for this I am using the NSScanner class and heres a view of my code

NSString *str = @" hello I am emp 1313 object of string class 123"; NSString *limit = @" object"; NSScanner *scanner = [NSScanner scannerWithString:str]; int i; [scanner scanInt:&i]; NSString *output; [scanner scanUpToString:limit intoString:&output]; NSLog(@"%d",i);

but the problem is that I am not able to do it and I want to use NSScanner class only so can you experts give me some suggesstions regarding this.....

Nick Moore · Accepted Answer · 2010-10-27 13:43:03Z

Give this a try:

NSString *str = @" hello i am emp 1313 object of string class 123"; NSScanner *scanner = [NSScanner scannerWithString:str]; // set it to skip non-numeric characters [scanner setCharactersToBeSkipped:[[NSCharacterSet decimalDigitCharacterSet] invertedSet]]; int i; while ([scanner scanInt:&i]) { NSLog(@"Found int: %d",i); } // reset the scanner to skip numeric characters [scanner setScanLocation:0]; [scanner setCharactersToBeSkipped:[NSCharacterSet decimalDigitCharacterSet]]; NSString *resultString; while ([scanner scanUpToCharactersFromSet:[NSCharacterSet decimalDigitCharacterSet] intoString:&resultString]) { NSLog(@"Found string: %@",resultString); }

It outputs:

2010-10-27 14:40:39.137 so[2482:a0f] Found int: 1313 2010-10-27 14:40:39.140 so[2482:a0f] Found int: 123 2010-10-27 14:40:39.141 so[2482:a0f] Found string: hello i am emp 2010-10-27 14:40:39.141 so[2482:a0f] Found string: object of string class

am trying to do the same by this piece of line [scanner setCharactersToBeSkipped:[[NSCharacterSet alphanumericCharacterSet]invertedSet]];
i've updated the answer to include scanning for strings. invertedSet basically says "all characters except these ones"

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