How to find if NSString contains decimal + certain other characters.

NSMutableCharacterSet *_mySet = [NSMutableCharacterSet characterSetWithCharactersInString:@"aAfF"];

[_mySet formUnionWithCharacterSet:[NSCharacterSet decimalDigitCharacterSet]];

NSCharacterSet *myStringSet = [NSCharacterSet characterSetWithCharactersInString:mystring];

if ([_mySet isSupersetOfSet: myStringSet])

{

//This is will be true if myString contains ONLY " decimal numbers(0-9) and characters a,A,f,F"

        

}

Note: First 2 code lines tell you how to join 2 character sets.