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Learning Regular Expressions [closed]

I don't really understand regular expressions. Can you explain them to me in an easy-to-follow manner? If there are any online tools or books, could you also link to them? ...
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How can I read a text file in Android?

...t to read the text from a text file. In the code below, an exception occurs (that means it goes to the catch block). I put the text file in the application folder. Where should I put this text file (mani.txt) in order to read it correctly? ...
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How to remove part of a string? [closed]

How can I remove part of a string? 9 Answers 9 ...
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How can I find the number of days between two Date objects in Ruby?

How can I find the number of days between two Date objects? 10 Answers 10 ...
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Switching between tabs in NERDTree

I've just started using the NERDTree vim plugin for my project. 9 Answers 9 ...
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How do I get jQuery to select elements with a . (period) in their ID?

Given the following classes and controller action method: 8 Answers 8 ...
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Converting a String to DateTime

How do you convert a string such as 2009-05-08 14:40:52,531 into a DateTime ? 17 Answers ...
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Ruby: extend self

In Ruby, I understand the basic idea of extend . However, what's happening in this segment of code? Specifically, what does extend do? Is it just a convenient way of making the instance methods into class methods? Why would you do it this way rather than specifying class methods from the beginnin...
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How to round a number to significant figures in Python

I need to round a float to be displayed in a UI. E.g, to one significant figure: 20 Answers ...
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Find and kill a process in one line using bash and regex

I often need to kill a process during programming. 25 Answers 25 ...