Cleanest way to remove trailing blanks a string in swift?

Question

In Perl if I had trailing blanks in a string, I would use this code

$line =~ s/ +$//;

Is there a similar command or function in swift?

No built-in syntax, no. There are regex classes, of course. Some discussion of usage: http://benscheirman.com/2014/06/regex-in-swift/ — Paul Roub, Apr 13 '15 at 20:50
Have a look at: http://stackoverflow.com/questions/28570973/how-should-i-remove-all-the-spaces-from-a-string-swift — Hunter McMillen, Apr 13 '15 at 20:52
possible duplicate http://stackoverflow.com/questions/26797739/does-swift-has-trim-method-on-string — Victor Sigler, Apr 13 '15 at 21:03
Not really a duplicate. I was looking more for a perl/regex kind of command. As I have much more complicated parsing to do but this is a start. — μολὼν.λαβέ, Apr 13 '15 at 21:05
@GAlexander Then you have to broad more your question to understanding you better. — Victor Sigler, Apr 13 '15 at 21:14

matt · Accepted Answer · 2015-04-13T21:19:28.127

2

Swift provides no support for regular expressions. It doesn't need to, though, because the only place you'll ever use Swift is in the presence of Cocoa — and Cocoa's Foundation framework does provide support for regular expressions (and has other string-handling commands). Swift String and Framework's NSString are bridged to one another.

Thus, you could use stringByReplacingOccurrencesOfString:withString:options:range: with a regular expression pattern, for example (assuming that stringByTrimmingCharactersInSet: is too simple-minded for your purposes).

edited Apr 13 '15 at 21:19

answered Apr 13 '15 at 21:13

matt

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Good answer, this will work. `stringByReplacingOccurrencesOfString:withString:options:range:` – μολὼν.λαβέ Apr 13 '15 at 21:23
Matt alludes to a better answer for this specific case which is `stringByTrimmingCharactersInSet:` – David Berry Apr 13 '15 at 23:28

Jeehut · Answer 2 · 2016-09-20T22:37:44.323

If you want to do this multiple times I suggest you add this handy extension to your project:

extension String {
    var strip: String {
        return self.trimmingCharacters(in: .whitespaces)
    }
}

Now you can do something as simple as this:

let line = " \t BB-8 likes Rey \t "
line.strip // => "BB-8 likes Rey"

If you prefer a Framework that also has some more handy features then checkout HandySwift. You can add it to your project via Carthage then use it exactly like in the example above:

import HandySwift    

let line = "  BB-8 likes Rey  "
line.strip // => "BB-8 likes Rey"

Cleanest way to remove trailing blanks a string in swift?

2 Answers2