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Check if a string matches a regex in Bash script
...=~ ^regex$ ]] && echo "matched" || echo "did not match"
where commands after && are executed if the test is successful, and commands after || are executed if the test is unsuccessful.
Note this is based on the solution by Aleks-Daniel Jakimenko in User input date format verification...
How can I check if a background image is loaded?
...http://picture.de/image.png)');
});
this will create new image in memory and use load event to detect when the src is loaded.
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How do you prevent install of “devDependencies” NPM modules for Node.js (package.json)?
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The npm install command will install the devDependencies along other dependencies when run inside a package directory, in a development environment (the default).
Use npm install --only=prod (or --only=production) to install only dependencies, ...
Changing CSS Values with Javascript
...sy to set inline CSS values with javascript. If I want to change the width and I have html like this:
9 Answers
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Convert Rows to columns using 'Pivot' in SQL Server
I have read the stuff on MS pivot tables and I am still having problems getting this correct.
8 Answers
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How to declare variable and use it in the same Oracle SQL script?
I want to write reusable code and need to declare some variables at the beginning and reuse them in the script, such as:
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What exactly is Python's file.flush() doing?
...rs created by the runtime/library/language that you're programming against and is meant to speed things up by avoiding system calls for every write. Instead, when you write to a file object, you write into its buffer, and whenever the buffer fills up, the data is written to the actual file using sys...
What's the best way to get the last element of an array without deleting it?
... many different options. To be able to choose from them I needed to understand their behavior and performance. In this answer I will share my findings with you, benchmarked against PHP versions 5.6.38, 7.2.10 and 7.3.0RC1 (expected Dec 13 2018).
The options (<<option code>>s) I will tes...
Openssl is not recognized as an internal or external command
...integrated with Facebook. In one of Facebook's tutorials, I found this command:
15 Answers
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How to avoid the “divide by zero” error in SQL?
...nullif(divisor, 0) ..." breaks if divisor is NULL.
– Anderson
Dec 1 '14 at 10:51
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