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Replace all non-alphanumeric characters in a string

I have a string with which i want to replace any character that isn't a standard character or number such as (a-z or 0-9) with an asterisk. For example, "h^&ell`.,|o w]{+orld" is replaced with "h*ell*o*w*orld". Note that multiple characters such as "^&" get replaced with one asterisk. How would I go...
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How can I change the color of a Google Maps marker?

I'm using the Google Maps API to build a map full of markers, but I want one marker to stand out from the others. The simplest thing to do, I think, would be to change the color of the marker to blue, instead of red. Is this a simple thing to do or do I have to create a whole new icon somehow? If I ...
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What do the different readystates in XMLHttpRequest mean, and how can I use them?

XMLHttpRequest has 5 readyState s, and I only use 1 of them (the last one, 4 ). 5 Answers ...
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Overloading Macro on Number of Arguments

I have two macros FOO2 and FOO3 : 8 Answers 8 ...
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Fetch frame count with ffmpeg

Does anyone know how to fetch the number of total frames from a video file using ffmpeg? The render output of ffmpeg shows the current frame and I need the frame count to calculate the progress in percent. ...
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How to merge two sorted arrays into a sorted array? [closed]

This was asked of me in an interview and this is the solution I provided: 31 Answers 3...
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Android View.getDrawingCache returns null, only null

Would anyone please try to explain to me why 10 Answers 10 ...
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Multiprocessing - Pipe vs Queue

What are the fundamental differences between queues and pipes in Python's multiprocessing package ? 2 Answers ...
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Why use softmax as opposed to standard normalization?

In the output layer of a neural network, it is typical to use the softmax function to approximate a probability distribution: ...
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Append a NumPy array to a NumPy array

I have a numpy_array. Something like [ a b c ] . 9 Answers 9 ...