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How to check whether a string is Base64 encoded or not
...z0-9+/]{2}==)?$
In base64 encoding, the character set is [A-Z, a-z, 0-9, and + /]. If the rest length is less than 4, the string is padded with '=' characters.
^([A-Za-z0-9+/]{4})* means the string starts with 0 or more base64 groups.
([A-Za-z0-9+/]{4}|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{2}==)$ mean...
Replace a value if null or undefined in JavaScript
I have a requirement to apply the ?? C# operator to JavaScript and I don't know how.
Consider this in C#:
5 Answers
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Event system in Python
...raries to choose from, using very different terminology (events, signals, handlers, method dispatch, hooks, ...).
I'm trying to keep an overview of the above packages, plus the techniques mentioned in the answers here.
First, some terminology...
Observer pattern
The most basic style of event system ...
What is `git diff --patience` for?
... does the patience algorithm differ from the default git diff algorithm, and when would I want to use it?
3 Answers
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JS - get image width and height from the base64 code
...ve a base64 img encoded that you can find here . How can I get the height and the width of it?
4 Answers
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Difference between res.send and res.json in Express.js
What is actual difference between res.send and res.json as both seems to perform same operation of responding to client.
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Foreign Key naming scheme
I'm just getting started working with foreign keys for the first time and I'm wondering if there's a standard naming scheme to use for them?
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Can I specify a custom location to “search for views” in ASP.NET MVC?
... Is it not better if we skip Clearing the already registered engines and just add the new one and viewLocations shall have only the new ones?
– Prasanna
Sep 1 '14 at 11:43
3...
is node.js' console.log asynchronous?
...mat.apply(this, arguments) + '\n');
};
So it simply does some formatting and writes to process.stdout, nothing asynchronous so far.
process.stdout is a getter defined on startup which is lazily initialized, I've added some comments to explain things:
.... code here...
process.__defineGetter__('s...
How to invoke a Linux shell command from Java
I am trying to execute some Linux commands from Java using redirection (>&) and pipes (|). How can Java invoke csh or bash commands?
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