CODEWITHSUNDEEP
objective-cxcode
Dennis
Dennis

Reputation: 3678

How to extract/split numbers and string out from NSString

I have a NSString *text = @"randomtext12345"

The text string will always begins with 'string' (unknown length) and followed by 'number' (integer type).

There is no 'seperator' in between the text, how do I detect which is string and integer? in order to extract/seperate/seperate out the text to become

NSString *key = @"randomtext";
NSInteger value = 12345;

Upvotes: 2

Views: 2145

Answers (2)

lnafziger
lnafziger

Reputation: 25740

This assumes that all numeric values are grouped together at the end (i.e. there are no numbers in the "randomtext" portion). Also, I have not included error checking to make sure that the input string (text) is in the correct format. (i.e. there must be an alpha portion followed by a numeric portion):

NSString *text = @"randomtext12345";

NSRange beginningOfNumber = [text rangeOfCharacterFromSet:[NSCharacterSet decimalDigitCharacterSet]];
if (beginningOfNumber.location == NSNotFound)
{
    return;
}

NSString *key           = [text substringToIndex:beginningOfNumber.location];
NSString *stringValue   = [text substringFromIndex:beginningOfNumber.location];
NSInteger value         = [stringValue integerValue];

// Output:  2012-07-29 14:08:56.504 Testing App[46439:fb03] key: randomtext, value: 12345

Upvotes: 5

Ivan Andriollo
Ivan Andriollo

Reputation: 378

You need to add a separator string between the string and number.
"~" in this example.
NSInteger is not an object, so don't use the "*".


NSString *test = @"randomtext~12345";
NSArray *testItems = [test componentsSeparatedByString:@"~"];

NSString *key = [testItems objectAtIndex:0];
NSInteger value = [[testItems objectAtIndex:1] intValue];

NSLog(@"test key=%@ and value=%ld", key, value);

Upvotes: 1

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