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PHP Regex to check date is in YYYY-MM-DD format

I'm trying to check that dates entered by end users are in the YYYY-MM-DD. Regex has never been my strong point, I keep getting a false return value for the preg_match() I have setup. ...
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How exactly does the python any() function work?

In the python docs page for any , the equivalent code for the any() function is given as: 5 Answers ...
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Django ModelForm: What is save(commit=False) used for?

Why would I ever use save(commit=False) instead of just creating a form object from the ModelForm subclass and running is_valid() to validate both the form and model? ...
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CURL to access a page that requires a login from a different page

I have 2 pages: xyz.com/a and xyz.com/b . I can only access xyz.com/b if and only if I login to xyz.com/a first. If accessing xyz.com/b without going through the other, I simply get access denied (no redirect to login) via the browser. Once I login at xyz.com/a , I can access the other. ...
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How do I keep track of pip-installed packages in an Anaconda (Conda) environment?

I've installed and have been using the Anaconda Python distribution, and I have started using the Anaconda (Conda) environment. I can use the standard conda install... command to put packages from the distribution into my environments, but to use anything outside (i.e. Flask-WTF, flask-sqlalchem...
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Creating my own Iterators

I'm trying to learn C++ so forgive me if this question demonstrates a lack of basic knowledge, you see, the fact is, I have a lack of basic knowledge. ...
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Why does Math.Round(2.5) return 2 instead of 3?

In C#, the result of Math.Round(2.5) is 2. 15 Answers 15 ...
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What is the in a .vimrc file?

I see <leader> in many .vimrc files, and I am wondering what does it mean? 5 Answers ...
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Install MySQL on Ubuntu without a password prompt

How do I write a script to install MySQL server on Ubuntu? 4 Answers 4 ...
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Why do we need argc while there is always a null at the end of argv?

It seems that the argv[argc] is always NULL , so I think we can traverse the argument list without argc . A single while loop will do this. ...