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Undefined, unspecified and implementation-defined behavior

What is undefined behavior in C and C++? What about unspecified behavior and implementation-defined behavior? What is the difference between them? ...
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Easy way to test a URL for 404 in PHP?

...d I've found that sometimes the URL's that I feed into my code return 404, which gums up all the rest of my code. 15 Answer...
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How do you access the matched groups in a JavaScript regular expression?

I want to match a portion of a string using a regular expression and then access that parenthesized substring: 22 Answers...
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Sanitizing strings to make them URL and filename safe?

I am trying to come up with a function that does a good job of sanitizing certain strings so that they are safe to use in the URL (like a post slug) and also safe to use as file names. For example, when someone uploads a file I want to make sure that I remove all dangerous characters from the name. ...
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jQuery - Get Width of Element when Not Visible (Display: None)

It seems like in jQuery when an element is not visible width() returns 0. Makes sense, but I need to get the width of a table in order to set the width of the parent before I show the parent. ...
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Ruby: How to get the first character of a string

How can I get the first character in a string using Ruby? 13 Answers 13 ...
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IIS7 Permissions Overview - ApplicationPoolIdentity

We have recently upgraded to IIS7 as a core web server and I need an overview in terms of the permissions. Previously, when needing to write to the file system I would have give the AppPool user (Network Service) access to the directory or file. ...
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Having options in argparse with a dash

I want to have some options in argparse module such as --pm-export however when I try to use it like args.pm-export I get the error that there is not attribute pm . How can I get around this issue? Is it possible to have - in command line options? ...
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SVG get text element width

I'm working on some ECMAScript/JavaScript for an SVG file and need to get the width and height of a text element so I can resize a rectangle that surrounds it. In HTML I would be able to use the offsetWidth and offsetHeight attributes on the element but it appears that those properties are...
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Using success/error/finally/catch with Promises in AngularJS

I'm using $http in AngularJs, and I'm not sure on how to use the returned promise and to handle errors. 6 Answers ...