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Which regular expression operator means 'Don't' match this character?
...ple [^abcde] will match anything but a,b,c,d,e characters.
Instead of specifying all the characters literally, you can use shorthands inside character classes: [\w] (lowercase) will match any "word character" (letter, numbers and underscore), [\W] (uppercase) will match anything but word characters...
What's the difference between parenthesis $() and curly bracket ${} syntax in Makefile?
Is there any differences in invoking variables with syntax ${var} and $(var) ? For instance, in the way the variable will be expanded or anything?
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Why can't I access DateTime->date in PHP's DateTime class?
Using the DateTime class, if I try to run the following code:
5 Answers
5
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.NET HttpClient. How to POST string value?
... your project. The HttpClient class is built in .NET 4.5, not in .NET 4.0. If you want to use it in .NET 4.0 you need the NuGet!
– Darin Dimitrov
Mar 2 '13 at 16:42
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Append column to pandas dataframe
... way probably only matters when you consider edge cases. For instance here if both DataFrames had a 'data' column the join would fail, whereas a concat would give you two columns named 'data'.
– U2EF1
Dec 16 '13 at 20:37
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Setting Vim whitespace preferences by filetype
...ndent based on the size of tabstop, and then spaces after that. Of course, if expandtab is on, all the tabs that get inserted are converted to spaces. stackoverflow.com/questions/1562336/… might help further. Without expand tab, Peter's answer would insert tabs that are 2 chars wide, not spaces.
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Scala downwards or decreasing for loop?
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What is an abstract class in PHP?
...nd non-abstract methods, but it must contain at least one abstract method. If a class has at least one abstract method, then the class must be declared abstract.
Note: Traits support the use of abstract methods in order to impose requirements upon the exhibiting class.
Example below :
class ...
Continuous Integration for Ruby on Rails? [closed]
...utdated information and downed the demo site, this project has a spark of life again. But the documentation hasn't moved on, and lots and lots of the steps in the tutorial are just plain broken; I had to change references to gems, build some things out of band, and then I still couldn't get it worki...
How to convert std::string to lower case?
...no way to know whether the character is lowercase or uppercase otherwise.
If you really hate tolower(), here's a specialized ASCII-only alternative that I don't recommend you use:
char asciitolower(char in) {
if (in <= 'Z' && in >= 'A')
return in - ('Z' - 'z');
return...