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iOS 5 Best Practice (Release/retain?)

As a beginning iPhone programmer, what is the best practice for writing apps to be used either with iOS 5 or older versions? Specifically, should I continue using the release/retain of data, or should I ignore that? Does it matter? ...
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How do you match only valid roman numerals with a regular expression?

Thinking about my other problem , i decided I can't even create a regular expression that will match roman numerals (let alone a context-free grammar that will generate them) ...
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How to justify a single flexbox item (override justify-content)

You can override align-items with align-self for a flex item. I am looking for a way to override justify-content for a flex item. ...
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Are the PUT, DELETE, HEAD, etc methods available in most web browsers?

I've seen a couple questions around here like How to debug RESTful services , which mentions: 7 Answers ...
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What's the difference between window.location and document.location in JavaScript?

Should both of them reference the same object? 16 Answers 16 ...
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GitHub: Permission denied (publickey). fatal: The remote end hung up unexpectedly

I have followed these instructions below to upload a project. 23 Answers 23 ...
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problem with and :after with CSS in WebKit

I would like to add some style on a select box with the pseudo :after (to style my select box with 2 parts and without images). Here's the HTML: ...
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Maven package/install without test (skip tests)

I am trying to package my project. But, it automatically runs the tests previous do performing the packaging. The tests insert some content in the database. This is not what I want, I need to avoid running tests while package the application. Anybody knows how run the package with out test? ...
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Your content must have a ListView whose id attribute is 'android.R.id.list'

I have created an xml file like this: 7 Answers 7 ...
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Reading my own Jar's Manifest

I need to read the Manifest file, which delivered my class, but when I use: 12 Answers ...