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What is a non-capturing group in regular expressions?

...tps://stackoverflow.com/questions/tagged/regex Now, if I apply the regex below over it... (https?|ftp)://([^/\r\n]+)(/[^\r\n]*)? ... I would get the following result: Match "http://stackoverflow.com/" Group 1: "http" Group 2: "stackoverflow.com" Group 3: "/" Match "https://stac...
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How to determine an object's class?

If class B and class C extend class A and I have an object of type B or C , how can I determine of which type it is an instance? ...
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How to call function of one php file from another php file and pass parameters to it?

... Yes include the first file into the second. That's all. See an example below, File1.php : <?php function first($int, $string){ //function parameters, two variables. return $string; //returns the second argument passed into the function } ?> Now Using include (http://php.net/in...
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Can I pass an array as arguments to a method with variable arguments in Java?

I'd like to be able to create a function like: 5 Answers 5 ...
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How do I “git blame” a deleted line?

git blame is great for modified and added lines, but how can I find when a line that existed in a specific previous commit was eventually deleted. I'm thinking bisect , but I was hoping for something handier. ...
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Removing an activity from the history stack

... You can achieve this by setting the android:noHistory attribute to "true" in the relevant <activity> entries in your AndroidManifest.xml file. For example: <activity android:name=".AnyActivity" android:noHistory="true" /> ...
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Algorithm to calculate the number of divisors of a given number

What would be the most optimal algorithm (performance-wise) to calculate the number of divisors of a given number? 27 Answe...
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data.table vs dplyr: can one do something well the other can't or does poorly?

I'm relatively familiar with data.table , not so much with dplyr . I've read through some dplyr vignettes and examples that have popped up on SO, and so far my conclusions are that: ...
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How to get ASCII value of string in C#

... From MSDN string value = "9quali52ty3"; // Convert the string into a byte[]. byte[] asciiBytes = Encoding.ASCII.GetBytes(value); You now have an array of the ASCII value of the bytes. I got the following: 57 113 117 97 108 105 53 50 116 121 51 ...
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Git fetch remote branch

My colleague and I are working on the same repository. We've branched it into two branches, each technically for different projects, but they have similarities, so we'll sometimes want to commit back to the * master from the branch . ...