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Most efficient way to remove special characters from string

I want to remove all special characters from a string. Allowed characters are A-Z (uppercase or lowercase), numbers (0-9), underscore (_), or the dot sign (.). ...
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subtle differences between JavaScript and Lua [closed]

...= operators are of lower precedence than >, >=, <, <=. In Lua, all comparison operators are the same precedence. Lua supports tail calls. UPDATE: JS now supports tail calls. Lua supports assignment to a list of variables. While it isn't yet standard in Javascript, Mozilla's JS engine ...
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What does O(log n) mean exactly?

...g that the size of the input affects the growth of the algorithm proportionally...and the same goes for, for example, quadratic time O(n2) etc..even algorithms, such as permutation generators, with O(n!) times, that grow by factorials. ...
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Change the selected value of a drop-down list with jQuery

... jQuery's documentation states: [jQuery.val] checks, or selects, all the radio buttons, checkboxes, and select options that match the set of values. This behavior is in jQuery versions 1.2 and above. You most likely want this: $("._statusDDL").val('2'); ...
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C#: Assign same value to multiple variables in single statement

...nteresting to know that the get accessor of the intermediate value is not called. Only the set accessor is invoked for all property accessed in the assignation sequence. Take for example a class that write to the console everytime the get and set accessor are invoked. static void Main(string[] arg...
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Trying to mock datetime.date.today(), but not working

... There are a few problems. First of all, the way you're using mock.patch isn't quite right. When used as a decorator, it replaces the given function/class (in this case, datetime.date.today) with a Mock object only within the decorated function. So, only within...
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Specifically, what's dangerous about casting the result of malloc?

Now before people start marking this a dup, I've read all the following, none of which provide the answer I'm looking for: ...
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How to debug JavaScript / jQuery event bindings with Firebug or similar tools?

...ked!') }" }) See jQuery.fn.data (where jQuery stores your handler internally). jQuery 1.8.x var clickEvents = $._data($('#foo')[0], "events").click; jQuery.each(clickEvents, function(key, handlerObj) { console.log(handlerObj.handler) // prints "function() { console.log('clicked!') }" }) ...
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Dynamically updating plot in matplotlib

...out the more modern animation examples in the matplotlib documentation. Finally, the animation API defines a function FuncAnimation which animates a function in time. This function could just be the function you use to acquire your data. Each method basically sets the data property of the object be...
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Can anyone explain python's relative imports?

... Thanks, but this honestly seems really silly. For such a beautiful language, I can't believe the designers would create such a restriction. Isn't there any other way? – carl Dec 16 '09 at 23:48 ...