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How to validate an email address in JavaScript
....,;:\s@\"]+\.)+[^<>()[\]\.,;:\s@\"]{2,})$/i;
But keep in mind that one should not rely only upon JavaScript validation. JavaScript can easily be disabled. This should be validated on the server side as well.
Here's an example of the above in action:
function validateEmail(email) {
c...
How to get the path of a running JAR file?
...roblems with special characters, including spaces and pluses. The correct one-liner is: return new File(MyClass.class.getProtectionDomain().getCodeSource().getLocation().toURI()); Using URLDecoder does not work for many special characters. See my answer below for further details.
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Pros and cons of using sbt vs maven in Scala project [closed]
...cala? What are the pros and cons of each of them? How to I determine which one of them to use in a project?
2 Answers
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Learning to write a compiler [closed]
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I think one worth mentioning is Coursera's compilers course. It has nice videos and walks through creating a java like language / simple compiler. Coursera Compilers Link
– QuantumKarl
Feb 24 '1...
What's the best way to parse command line arguments? [closed]
...u are better off going with optparse over getopt. getopt is pretty much a one-to-one mapping of the standard getopt(3) C library functions, and not very easy to use.
optparse, while being a bit more verbose, is much better structured and simpler to extend later on.
Here's a typical line to add an...
C/C++ Struct vs Class
...fault to public in structs—a struct written like a C struct behaves like one.)
While it's possible to fake some OOP in C—for instance, defining functions which all take a pointer to a struct as their first parameter, or occasionally coercing structs with the same first few fields to be "sub/sup...
Please explain some of Paul Graham's points on Lisp
... at (println and ends at the ) far to the right. This is lexed / parsed as one would expect, but already an important point arises: the result is not some special compiler-specific AST representation -- it's just a regular Clojure / Lisp data structure, namely a nested list containing a bunch of sym...
round() for float in C++
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There's no round() in the C++98 standard library. You can write one yourself though. The following is an implementation of round-half-up:
double round(double d)
{
return floor(d + 0.5);
}
The probable reason there is no round function in the C++98 standard library is that it can in f...
Creating a URL in the controller .NET MVC
... UrlHelper; there is a .Url property on the controller which will give you one with the correct RequestContext.
– Tobias J
Nov 14 '13 at 15:34
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Django filter queryset __in for *every* item in list
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Summary:
One option is, as suggested by jpic and sgallen in the comments, to add .filter() for each category. Each additional filter adds more joins, which should not be a problem for small set of categories.
There is the aggregation...