I have a string that contains words as well as a number. How can I extract that number from the string?
NSString *str = @"This is my string. #1234";
I would like to be able to strip out 1234 as an int. The string will have different numbers and words each time I search it.
Ideas?
Here's an NSScanner based solution:
// Input
NSString *originalString = @"This is my string. #1234";
// Intermediate
NSString *numberString;
NSScanner *scanner = [NSScanner scannerWithString:originalString];
NSCharacterSet *numbers = [NSCharacterSet characterSetWithCharactersInString:@"0123456789"];
// Throw away characters before the first number.
[scanner scanUpToCharactersFromSet:numbers intoString:NULL];
// Collect numbers.
[scanner scanCharactersFromSet:numbers intoString:&numberString];
// Result.
int number = [numberString integerValue];
(Some of the many) assumptions made here:
int
.Alternatively you could scan direct to the int
:
[scanner scanUpToCharactersFromSet:numbers intoString:NULL];
int number;
[scanner scanInt:&number];
If the #
marks the start of the number in the string, you could find it by means of:
[scanner scanUpToString:@"#" intoString:NULL];
[scanner setScanLocation:[scanner scanLocation] + 1];
// Now scan for int as before.