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How do you use a variable in a regular expression?

I would like to create a String.replaceAll() method in JavaScript and I'm thinking that using a regex would be most terse way to do it. However, I can't figure out how to pass a variable in to a regex. I can do this already which will replace all the instances of "B" with "A" . ...
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Extract hostname name from string

...pm package psl (Public Suffix List). The "Public Suffix List" is a list of all valid domain suffixes and rules, not just Country Code Top-Level domains, but unicode characters as well that would be considered the root domain (i.e. www.食狮.公司.cn, b.c.kobe.jp, etc.). Read more about it here. T...
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Is there a performance impact when calling ToList()?

...on) constructor. This constructor must make a copy of the array (more generally IEnumerable<T>), otherwise future modifications of the original array will change on the source T[] also which wouldn't be desirable generally. I would like to reiterate this will only make a difference with a hu...
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Switch case with fallthrough?

I am looking for the correct syntax of the switch statement with fallthrough cases in Bash (ideally case-insensitive). In PHP I would program it like: ...
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Re-entrant locks in C#

.....} is shorthand for using the Monitor class. As Marc points out, Monitor allows re-entrancy, so repeated attempts to lock on an object on which the current thread already has a lock will work just fine. If you start locking on different objects, that's when you have to be careful. Pay particular ...
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Preview layout with merge root tag in Intellij IDEA/Android Studio

...some attributes to the root view (in this case RelativeLayout) programmatically, like padding. Of course they're not applied in this helper layout (because you use a completely other view). The only solution was to use the whole custom view in the helper layout. – Felix Edelman...
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What's the difference between Html.Label, Html.LabelFor and Html.LabelForModel

...bel for an input whose name matches the specified input text (more specifically, for the model property matching the string expression): // Model public string Test { get; set; } // View @Html.Label("Test") // Output <label for="Test">Test</label> Html.LabelFor gives you a label for...
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Simplest code for array intersection in javascript

...ns, where n is * n = MIN(a.length, b.length) */ function intersection_destructive(a, b) { var result = []; while( a.length > 0 && b.length > 0 ) { if (a[0] < b[0] ){ a.shift(); } else if (a[0] > b[0] ){ b.shift(); } else /* they're equal */ ...
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What is the difference between 'log' and 'symlog'?

... I finally found some time to do some experiments in order to understand the difference between them. Here's what I discovered: log only allows positive values, and lets you choose how to handle negative ones (mask or clip). syml...
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Forgot “git rebase --continue” and did “git commit”. How to fix?

... This totally worked, and was also the first time I found a use for --soft. Nice to know how it works, thanks! – mmocny Jan 30 '13 at 18:12 ...