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Regex to match a digit two or four times

It's a simple question about regular expressions, but I'm not finding the answer. 2 Answers ...
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django - query filter on manytomany is empty

In Django is there a way to filter on a manytomany field being empty or null. 2 Answers ...
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How to randomly sort (scramble) an array in Ruby?

I'd like to have my array items scrambled. Something like this: 5 Answers 5 ...
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How to copy yanked text to VI command prompt

I want to know if there is any way by which I can paste yanked text to the command window. For instance if I have yanked a word and I want to grep it in some location I can't simply paste the word using 'p'. However if I copy it to clipboard, Shift-Insert will paste the same thing. ...
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_=> what does this underscore mean in Lambda expressions?

What does an lambda expression like _=> expr mean? 5 Answers 5 ...
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How to create a self-signed certificate with OpenSSL

I'm adding HTTPS support to an embedded Linux device. I have tried to generate a self-signed certificate with these steps: ...
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How to create a temporary directory and get the path / file name in Python

how to create a temporary directory and get the path / file name in python 5 Answers 5...
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How to delete object from array inside foreach loop?

I iterate through an array of objects and want to delete one of the objects based on it's 'id' property, but my code doesn't work. ...
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Can someone explain collection_select to me in clear, simple terms?

I am going through the Rails API docs for collection_select and they are god-awful. 2 Answers ...
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Connect to a heroku database with pgadmin

I would like to manage my heroku database with pgadmin client. By now, I've been doing this with psql . When I use data from heroku pg:credentials to connect de DB using pgadmin , I obtain: ...