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?
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1No built-in syntax, no. There are regex classes, of course. Some discussion of usage: benscheirman.com/2014/06/regex-in-swiftPaul Roub– Paul Roub2015-04-13 20:50:02 +00:00Commented Apr 13, 2015 at 20:50
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Thanks, I'll have a look.μολὼν.λαβέ– μολὼν.λαβέ2015-04-13 20:52:11 +00:00Commented Apr 13, 2015 at 20:52
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4Have a look at: stackoverflow.com/questions/28570973/…Hunter McMillen– Hunter McMillen2015-04-13 20:52:46 +00:00Commented Apr 13, 2015 at 20:52
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possible duplicate stackoverflow.com/questions/26797739/…Vkt0r– Vkt0r2015-04-13 21:03:54 +00:00Commented Apr 13, 2015 at 21:03
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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– μολὼν.λαβέ2015-04-13 21:05:54 +00:00Commented Apr 13, 2015 at 21:05
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2 Answers
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).
2 Comments
μολὼν.λαβέ
Good answer, this will work.
stringByReplacingOccurrencesOfString:withString:options:range:
David Berry
Matt alludes to a better answer for this specific case which is
stringByTrimmingCharactersInSet: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"
