Find characters from the given string with numbers.

Question

How do I get string using NSScanner from a string which contains string as well as numbers too?

i.e. 001234852ACDSB

The result should be 001234852 and ACDSB

I am able to get numbers from the string using NSScanner and characters by using stringByReplacingOccurrencesOfString but I want to know, is that possible to get string from with the use of NSScanner or any other built in methods?

I would like to know the Regex for the same.

It's unclear what you're asking... you want to use an NSScanner to get a string from a string? Are you trying to remove all the numbers and just get the letters? Please give an example of sample input and its expected output. — BJ Homer, Jul 30 '11 at 05:27
It seems he wants to separate the digits from the letters and get a string with digits and one with letters as result. Alhough he doesn't say so, I assume the numbers are together in one part of the string and the letters in the rest of it, or they alternate. — Rudy Velthuis, Jul 30 '11 at 05:50

score 2 · Answer 1 · answered Jul 30 '11 at 05:53

If you can guarantee that the string always consists of numbers followed by letters, then you could do the following with NSScanner:

NSScanner *scanner = [NSScanner scannerWithString:@"001234852ACDSB"];

NSString *theNumbers = nil;

[scanner scanCharactersFromSet:[NSCharacterSet decimalDigitCharacterSet]
                    intoString:&theNumbers];

NSString *theLetters = nil;
[scanner scanCharactersFromSet:[NSCharacterSet letterCharacterSet]
                    intoString:&theLetters];

A regular expression capturing the same things would look like this:

([0-9]+)([a-zA-Z]+)

Thanks Sir. This code is partially helpful to me, because it is not at all guaranteed about the placing of numbers and letters. — alloc_iNit, Jul 30 '11 at 06:02

score 2 · Accepted Answer · answered Aug 01 '11 at 04:18

Finally after google for the same and go through some information from net, I reached to my destination. With this I'm posting the code, this may help many who are facing the same problem as I have.

    NSString *str = @"001234852ACDSB";
    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);    //001234852
    }

    // 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);    //ACDSB
    }

score 0 · Answer 3 · edited May 23 '17 at 11:47

0

You don't have to use a scanner to do it.

NSString *mixedString = @"01223abcdsadf";

NSString *numbers = [[mixedString componentsSeparatedByCharactersInSet:[[NSCharacterSet characterSetWithCharactersInString:@"0123456789"] invertedSet]] componentsJoinedByString:@""];

NSString *characters = [[mixedString componentsSeparatedByCharactersInSet:[[NSCharacterSet characterSetWithCharactersInString:@"abcdefghijklmnouprstuwvxyz"] invertedSet]] componentsJoinedByString:@""];

For other possible solution view this question Remove all but numbers from NSString

edited May 23 '17 at 11:47

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answered Jul 30 '11 at 05:48

Cyprian

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Thanks for the reply. The requirement was to complete the task with the use of NSScanner, that's why one have to play in boundaries.:) – alloc_iNit Jul 30 '11 at 05:53
Np. just see the attached link, it has an answer using scanner. – Cyprian Jul 30 '11 at 05:55

Find characters from the given string with numbers.

3 Answers3