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How to check whether a string is Base64 encoded or not

I want to decode a Base64 encoded string, then store it in my database. If the input is not Base64 encoded, I need to throw an error. ...
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Get exit code of a background process

I have a command CMD called from my main bourne shell script that takes forever. 12 Answers ...
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How to remove Firefox's dotted outline on BUTTONS as well as links?

I can make Firefox not display the ugly dotted focus outlines on links with this: 25 Answers ...
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Count number of matches of a regex in Javascript

I wanted to write a regex to count the number of spaces/tabs/newline in a chunk of text. So I naively wrote the following:- ...
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Hadoop “Unable to load native-hadoop library for your platform” warning

I'm currently configuring hadoop on a server running CentOs . When I run start-dfs.sh or stop-dfs.sh , I get the following error: ...
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Text Progress Bar in the Console [closed]

I wrote a simple console app to upload and download files from an FTP server using the ftplib. 31 Answers ...
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How to stop app that node.js express 'npm start'

You build node.js app with express v4.x then start your app by npm start . My question is how to stop the app? Is there npm stop ? ...
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What does `void 0` mean? [duplicate]

Reading through the Backbone.js source code, I saw this: 3 Answers 3 ...
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Selecting a row in DataGridView programmatically

How can I select a particular range of rows in a DataGridView programmatically at runtime? 8 Answers ...
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How can I check if a URL exists via PHP?

How do I check if a URL exists (not 404) in PHP? 22 Answers 22 ...