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How should I validate an e-mail address?

What's a good technique for validating an e-mail address (e.g. from a user input field) in Android? org.apache.commons.validator.routines.EmailValidator doesn't seem to be available. Are there any other libraries doing this which are included in Android already or would I have to use RegExp? ...
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Required tags not present when using Delphi XML Data Binding Wizard

... Not sure to understand but maybe what you are looking for is : use="optional" <xs:element name="MyReport" type="MyReportType" /> <xs:complexType name="MyReportType"> <xs:all> <xs:element name="Header" type="HeaderType" use="optional" /> <xs:e...
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What is the difference between isinstance('aaa', basestring) and isinstance('aaa', str)?

... In Python versions prior to 3.0 there are two kinds of strings "plain strings" and "unicode strings". Plain strings (str) cannot represent characters outside of the Latin alphabet (ignoring details of code pages for simplicity). Unicode strings (u...
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How to get the function name from within that function?

...ion.caller is non-standard. Function.caller and arguments.callee are both forbidden in strict mode. Edit: nus's regex based answer below achieves the same thing, but has better performance! In ES6, you can just use myFunction.name. Note: Beware that some JS minifiers might throw away function nam...
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How to evaluate a math expression given in string form?

... With JDK1.6, you can use the built-in Javascript engine. import javax.script.ScriptEngineManager; import javax.script.ScriptEngine; import javax.script.ScriptException; public class Test { public static void main(String[] args) throws ScriptException { ScriptEngineManager mgr =...
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When should I use ugettext_lazy?

I have a question about using ugettext and ugettext_lazy for translations. I learned that in models I should use ugettext_lazy , while in views ugettext. But are there any other places, where I should use ugettext_lazy too? What about form definitions? Are there any performance diffrences betwe...
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How to check whether a file is empty or not?

I have a text file. How can I check whether it's empty or not? 10 Answers 10 ...
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How do I remove deleted branch names from autocomplete?

... One possible reason for this is that, if a remote branch (e.g. origin/myBranch) still exists, then git checkout myBranch will succeed as an alternative to git checkout -b myBranch origin/myBranch. This is intended as a convenience for the common ...
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Html.RenderPartial giving me strange overload error?

...made a test partial page named _Test.cshtml and put it in the same directory as my view that will be calling it, here it is: ...
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How to convert xml into array in php?

...hp.net/manual/en/book.simplexml.php The syntax looks something like this for your example $xml = new SimpleXMLElement($xmlString); echo $xml->bbb->cccc->dddd['Id']; echo $xml->bbb->cccc->eeee['name']; // or........... foreach ($xml->bbb->cccc as $element) { foreach($eleme...