Hi! Trying to find a way to scan a string with NSScanner. I’ve never used it before and need some help figuring out how to find an “s” followed by 2 numbers i.e s75…

Heres my first lines of code for finding the “s” but it just locks the program… Any ideas and suggestions is very much appreciated!

NSScanner *scanner = [NSScanner scannerWithString:fileName]; NSCharacterSet *charSet = [NSCharacterSet characterSetWithCharactersInString:@”s”]; NSString *scannerString;

while([scanner isAtEnd] == NO){ [scanner scanUpToCharactersFromSet:charSet intoString:&scannerString]; }

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infinity loop because there are no char before ‘s’ in your example…

try with this code:

NSScanner *scanner = [NSScanner scannerWithString:fileName]; NSCharacterSet *charSet = [NSCharacterSet characterSetWithCharactersInString:@”75s”]; NSString *scannerString = nil;

while([scanner isAtEnd] == NO){ if(![scanner scanUpToCharactersFromSet:charSet intoString:&scannerString]) break; }

scannerString <- @”75”

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Point of information: if you want to ‘characterize’ (no pun intended) a position in a string, use the term “digit”, rather than “number”. A “number” can contain more than one “digit”.

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Ok, I didn’t mean to search the charSet for a “s”… I have a fileName, for example: @”gilmore.girls.s03e20” and I want to find the “03” after the “s” and “20” after the “e”… Maybe it’s easier to just step through the whole string with -characterAtIndex??

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Or just use regex, which is the most logical.

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Try /a-zA-Z/ or the like.

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Specifically, s([0-9]+)e([0-9]+)$ should net you the season and episode number, assuming that there aren’t any other extensions afterward. I’d suggest checking out the RegularExpressions software (q.v.).