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Search and replace in bash using regular expressions
...NNNXNNXNNNNXXXXXXNNNNNXXX
Note that the subsequent -e's are processed in order. Also, the g flag for the expression will match all occurrences in the input.
You can also pick your favorite tool using this method, i.e. perl, awk, e.g.:
echo "$MYVAR" | perl -pe 's/[a-zA-Z]/X/g and s/[0-9]/N/g'
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How to write trycatch in R
I want to write trycatch code to deal with error in downloading from the web.
5 Answers
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Singleton: How should it be used
...an answer that has links to a lot of questions/answers about singletons: More info about singletons here:
24 Answers
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Mocking vs. Spying in mocking frameworks
In mocking frameworks, you can mock an object or spy on it. What's the difference between the two and when would/should I use one over the other?
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Spring MVC: How to perform validation?
I would like to know what is the cleanest and best way to perform form validation of user inputs. I have seen some developers implement org.springframework.validation.Validator . A question about that: I saw it validates a class. Does the class have to be filled manually with the values from the us...
How do you implement a good profanity filter?
...ies, and situations where the input text can potentially contain profanity or undesirable language. Oftentimes this needs to be filtered out.
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Can git ignore a specific line?
...r, that you can declare in a .gitattributes file (as presented in the "Keyword expansion" of "Git Attributes"):
*.yourType filter=yourFilterName
(you can even set that filter for a specific file, if you want)
Implement:
yourFilterName.smudge (triggered on git checkout) and
git config --global f...
Explain the concept of a stack frame in a nutshell
...me would represent a function call and its argument data.
If I remember correctly, the function return address is pushed onto the stack first, then the arguments and space for local variables. Together, they make the "frame," although this is likely architecture-dependent. The processor knows how ...
Can pandas automatically recognize dates?
...ositively surprised by the fact that while reading data from a data file (for example) pandas is able to recognize types of values:
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What is an abstract class in PHP?
...e purpose of this is to provide a kind of template to inherit from and to force the inheriting class to implement the abstract methods.
An abstract class thus is something between a regular class and a pure interface. Also interfaces are a special case of abstract classes where ALL methods are abst...