Remove all non-numeric characters from an NSString, keeping spaces

Question

I am trying to remove all of the non-numeric characters from an NSString, but I also need to keep the spaces. Here is what I have been using.

NS         


        

Answer 1

try using NSScanner

NSString *originalString = @"(123) 123123 abc";
NSMutableString *strippedString = [NSMutableString 
    stringWithCapacity:originalString.length];

NSScanner *scanner = [NSScanner scannerWithString:originalString];
NSCharacterSet *numbers = [NSCharacterSet 
    characterSetWithCharactersInString:@"0123456789 "];

while ([scanner isAtEnd] == NO) {
    NSString *buffer;
    if ([scanner scanCharactersFromSet:numbers intoString:&buffer]) {
        [strippedString appendString:buffer];
    } else {
        [scanner setScanLocation:([scanner scanLocation] + 1)];
    }
}

NSLog(@"%@", strippedString); // "123123123"