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How to validate an e-mail address in swift?
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I would use NSPredicate:
func isValidEmail(_ email: String) -> Bool {
let emailRegEx = "[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,64}"
let emailPred = NSPredicate(format:"SELF MATCHES %@", emailRegEx)
return emailPred.evaluate(with: email)
}
for v...
When should I use ugettext_lazy?
...y executed once (mostly on django's startup); ugettext_lazy translates the strings in a lazy fashion, which means, eg. every time you access the name of an attribute on a model the string will be newly translated-which totally makes sense because you might be looking at this model in different langu...
Java Map equivalent in C#
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You can index Dictionary, you didn't need 'get'.
Dictionary<string,string> example = new Dictionary<string,string>();
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example.Add("hello","world");
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Console.Writeline(example["hello"]);
An efficient way to test/get values is TryGetValue (thanx to Earwicker):
if (ot...
Difference between File.separator and slash in paths
... difference between using File.separator and a normal / in a Java Path-String?
14 Answers
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How to format a floating number to fixed width in Python
...0
The format specifier inside the curly braces follows the Python format string syntax. Specifically, in this case, it consists of the following parts:
The empty string before the colon means "take the next provided argument to format()" – in this case the x as the only argument.
The 10.4f par...
Linux find file names with given string
... files in the current directory and subdirectories whose name contains the string "John". I know that grep can match the content in the files, but I have no idea how to use it with file names. Any help would be appreciated.
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How can I display a pdf document into a Webview?
...ViewById(R.id.webview);
webview.getSettings().setJavaScriptEnabled(true);
String pdf = "http://www.adobe.com/devnet/acrobat/pdfs/pdf_open_parameters.pdf";
webview.loadUrl("https://drive.google.com/viewerng/viewer?embedded=true&url=" + pdf);
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How do I use DateTime.TryParse with a Nullable?
I want to use the DateTime.TryParse method to get the datetime value of a string into a Nullable. But when I try this:
9 A...
Open directory dialog
...pendencyProperty TextProperty = DependencyProperty.Register("Text", typeof(string), typeof(FolderEntry), new FrameworkPropertyMetadata(null, FrameworkPropertyMetadataOptions.BindsTwoWayByDefault));
public static DependencyProperty DescriptionProperty = DependencyProperty.Register("Description", ...
How to set a default entity property value with Hibernate
...nullable = false, columnDefinition = "int default 100")
Notice that the string in columnDefinition is database dependent. Also if you choose this option, you have to use dynamic-insert, so Hibernate doesn't include columns with null values on insert. Otherwise talking about default is irrelevant....