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Regex to check whether a string contains only numbers [duplicate]
... 123_456 or C++ 123'456. \d+ seems like a middle ground in the absence of more context like a specific programming or human language and was strongly suggested by the author's first attempt.
– Mike Samuel
Feb 22 '19 at 15:36
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Learning Ruby on Rails
As it stands now, I'm a Java and C# developer. The more and more I look at Ruby on Rails, the more I really want to learn it.
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When to use window.opener / window.parent / window.top
...t;
window.top refers to the top-most window from a window nested in one or more layers of <iframe> sub-windows
Those will be null (or maybe undefined) when they're not relevant to the referring window's situation. ("Referring window" means the window in whose context the JavaScript code is ...
Reducing MongoDB database file size
...press, however, you do have some options if you have another computer with more space.
Export the database to another computer with Mongo installed (using mongoexport) and then you can Import that same database (using mongoimport). This will result in a new database that is more compressed. Now yo...
How do I prompt for Yes/No/Cancel input in a Linux shell script?
... untranslated here (Install, Answer) which would need to be addressed in a more fully completed translation, but even a partial translation would be helpful in many cases.
Finally, please check out the excellent answer by F. Hauri.
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Algorithm to compare two images
... version of the other, therefore scaling the resolution down might provide more accurate results.
Consider scanning various prospective areas of the image that could represent zoomed portions of the image and various positions and rotations. It starts getting tricky if one of the images are a skew...
How can I unit test Arduino code?
...to tell you anything about the quality of your own work. Hence, it is far more valuable and efficient to write unit tests that do not run on the target device (or emulator).
Frequent testing on your target hardware has a painfully slow cycle:
Tweak your code
Compile and upload to Arduino device
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Disabling implicit animations in -[CALayer setNeedsDisplayInRect:]
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Which is more efficient: Multiple MySQL tables or one large table?
...s to different people for different part of the data collection, it may be more convenient to split them. (Of course, you can look at defining views and giving authorization on them appropriately).
(c) For moving data to different places, especially during development, it may make sense to use tab...
Open Source Alternatives to Reflector? [closed]
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