how to convert NSString to NSArray [duplicate]

Answer 1

You can achieve that using regular expression　

([0-9]+)

NSError* error = nil;
NSString* str = @"[90, 5, 6]";
NSRegularExpression* regex = [NSRegularExpression regularExpressionWithPattern:@"([0-9]+)" options:0 error:&error];
NSArray* matches = [regex matchesInString:str options:0 range:NSMakeRange(0, [str length])];

Then you have a NSArray of string, you just need to iterate it and convert the strings to number and insert them into an array.