Removing any non-letter from an NSString

Question

I am trying to remove from an NSString link , some characters that are not letters, that may appear at the start and and the end. Is there a simple, but safe way to do that ?

example :

NSString *link= @" www.something.com. "  //removing the `.`
NSString *link= @" [www.something.com] "  //removing the `[ ]`
NSString *link= @" www.something.com/ "  //removing the `/`

Thanks a lot.

score 1 · Answer 1 · answered Apr 29 '14 at 11:36

1

Just use this:

    NSCharacterSet *notAllowed = [[NSCharacterSet characterSetWithCharactersInString:@"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"] invertedSet];
    NSString *resultString = [[yourString componentsSeparatedByCharactersInSet:notAllowed] componentsJoinedByString:@""];

answered Apr 29 '14 at 11:36

leonmaia

11
1

Thanks, but is this removes only the first and the last at the string? – Apr 29 '14 at 12:17
this is not a good answer. you remove all the non letters from the whole string .... – Apr 29 '14 at 12:20

score 1 · Accepted Answer · answered Apr 29 '14 at 12:26

To remove unwanted characters from the start and end of the given string, use stringByTrimmingCharactersInSet:

NSString *link= @" www.something.com. ";
NSCharacterSet *charset = [[NSCharacterSet letterCharacterSet] invertedSet];
NSString *stripped = [link stringByTrimmingCharactersInSet:charset];

Removing any non-letter from an NSString

2 Answers2