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Regular expression for matching HH:MM time format

I want a regexp for matching time in HH:MM format. Here's what I have, and it works: 19 Answers ...
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Outline effect to text

Are there any ways in CSS to give outlines to text with different colors ? I want to highlight some parts of my text to make it more intuitive - like the names, links, etc. Changing the link colors etc. are common nowadays, so I want something new. ...
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How to convert floats to human-readable fractions?

Let's say we have 0.33 , we need to output 1/3 . If we have 0.4 , we need to output 2/5 . 26 Answers ...
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Plot a legend outside of the plotting area in base graphics?

As the title says: How can I plot a legend outside the plotting area when using base graphics? 10 Answers ...
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Why doesn't Python have a sign function?

I can't understand why Python doesn't have a sign function. It has an abs builtin (which I consider sign 's sister), but no sign . ...
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Selecting pandas column by location

I'm simply trying to access named pandas columns by an integer. 5 Answers 5 ...
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What is a good regular expression to match a URL? [duplicate]

Currently I have an input box which will detect the URL and parse the data. 6 Answers ...
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Cannot ping AWS EC2 instance

I have an EC2 instance running in AWS. When I try to ping from my local box it is not available. 25 Answers ...
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Getting the array length of a 2D array in Java

I need to get the length of a 2D array for both the row and column. I’ve successfully done this, using the following code: ...
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Add column with constant value to pandas dataframe [duplicate]

Given a DataFrame: 4 Answers 4 ...