Paste (Insert) into Label (IOS) only the numbers of String - ios

Question

I have code to implement the "Paste" function.
But there is an insertion of all symbols and not only numbers.
How can I make it so that I can insert only numbers ???
Creating an Extension file:
Swift extension example
Past (Photo)
Updated code
actionSheetController.addAction(
UIAlertAction(title: NSLocalizedString("Past", comment: ""), style: .default, handler: { [weak self] _ in
guard let strongSelf = self else { return }
strongSelf.displayResultLabel.text = UIPasteboard.general.string.onlyNumbers()
print ("Past")
})
)
extension String {
func onlyNumbers() ->String{
do{
let regex = try NSRegularExpression(pattern: "([//.,\\d])*", options:[.dotMatchesLineSeparators])
var result : String = ""
for resultMatch in regex.matches(in: self, options: NSRegularExpression.MatchingOptions.init(rawValue: 0), range: NSMakeRange(0, NSString(string: self).length)) {
result += NSString(string: self).substring(with: resultMatch.range)
}
return result
}
catch
{
}
return ""
}
}

Answer 1

Use this extension with regex function to get only the numbers of your String
extension String {
func onlyNumbers() ->String{
do{
let regex = try NSRegularExpression(pattern: "([//.,\\d])*", options:[.dotMatchesLineSeparators])
var result : String = ""
for resultMatch in regex.matches(in: self, options: NSRegularExpression.MatchingOptions.init(rawValue: 0), range: NSMakeRange(0, NSString(string: self).length)) {
result += NSString(string: self).substring(with: resultMatch.range)
}
return result
}
catch
{
}
return ""
}
}
you can use it like this
actionSheetController.addAction(
UIAlertAction(title: NSLocalizedString("Past", comment: ""), style: .default, handler: { [weak self] _ in
guard let strongSelf = self else { return }
strongSelf.displayResultLabel.text = UIPasteboard.general.string.onlyNumbers()
print ("Past")
})
)