How to remove non numeric characters from phone number in objective-c?

Question

This is my first attempt to make an ios app.

I\'m using people picker to ask the user for a phone number, but when it retrieves with the code below, my NSStrin

Answer 1

I think there are ways to solve this:

1. Using NSRegularExpression to remove anything but numbers. You can see here or here to know how to validate phone number.
2. Write your own scanner to remove characters you don't need. Remove blanks or remove all but numbers.
3. Use the UITextFieldDelegate, write the textField:shouldChangeCharactersInRange:replacementString: method, check the replacement string if it is in the range of 0-9.

Hope helps.

Answer 2

SWIFT 5.0 solution

let purePhoneNumber = phoneNumber.replacingOccurrences(of: "[^0-9]", 
                                                       with: "", 
                                                       options: .regularExpression)

If you want to leave + sign in string, you can use regexp [^0-9+].

Answer 3

You can use few methods of NSString and NSMutableString as :

NSString *phone=@"(0) 111192222-2222";
//I'm from Brazil and here the correct mask for mobile phone numbers is (01111) 92222-2222
NSMutableString *editPhone=[NSMutableString stringWithString:[phone stringByReplacingOccurrencesOfString:@")" withString:@""]];
editPhone=[NSMutableString stringWithString:[editPhone stringByReplacingOccurrencesOfString:@" " withString:@""]];

[editPhone insertString:@") " atIndex:6];


NSLog(@"%@",editPhone);//(01111) 92222-2222

Answer 4

I would use Regular expression to validate the phone number instead of killing myself to make a custom keyboard, which functions can be changed by iOS updates. So, allow all characters and validate inside the code.

Answer 5

See this answer: https://stackoverflow.com/a/6323208/60488

Basically:

NSString *cleanedString = [[phoneNumber componentsSeparatedByCharactersInSet:[[NSCharacterSet characterSetWithCharactersInString:@"0123456789-+()"] invertedSet]] componentsJoinedByString:@""];

For your case you may want to remove the characters "-", "(" and ")" from the character set.