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Java regex capturing groups indexes
...ttern is defined to be group number 0.
Any capturing group in the pattern start indexing from 1. The indices are defined by the order of the opening parentheses of the capturing groups. As an example, here are all 5 capturing groups in the below pattern:
(group)(?:non-capturing-group)(g(?:ro|u)p( ...
Where is the WPF Numeric UpDown control?
...
It should be noted that starting with version v3.7.0, the open sourced version of wpftoolkit is provided under a proprietary non-commercial license rather than MS-PL (reference)
– Jordoff
Dec 19 '19 at 0:30
...
Getting root permissions on a file inside of vi? [closed]
...begins the command; you will need to type this character in normal mode to start entering a command. It should be omitted in scripts.
sil[ent] suppresses output from the command. In this case, we want to stop the Press any key to continue-like prompt that appears after running the :! command.
ex...
How unique is UUID?
...d or someone clones your network card). I say "at least" because the clock starts at 15 October 1582, so you have about 400 years after the clock wraps before there is even a small possibility of duplications.
Version 4 is the random number UUID. There's six fixed bits and the rest of the UUID is 12...
How to remove from a map while iterating it?
...d next_it to the same values, you don't need to say "next_it = it;" at the start of the loop.
– cdgraham
Nov 7 '18 at 19:06
1
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How can I push to my fork from a clone of the original repo?
... branch tracks. However, git push -u myrepo master makes your local master start tracking myrepo/master. If, after that, you run git pull while on master, you will pull from myrepo, and no longer from origin.
– jub0bs
Nov 30 '18 at 18:55
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C++ static virtual members?
...rnative, since I think his enhanced implementation is overcomplicated.
We start with an abstract base class, that provides the interface for all the object types:
class Object
{
public:
virtual char* GetClassName() = 0;
};
Now we need an actual implementation. But to avoid having to write bo...
What is the result of % in Python?
...f a is uninteresting. Consider taking a POSIX timestamp (seconds since the start of 1970) and turning it into the time of day. Since there are 24*3600 = 86400 seconds in a day, this calculation is simply t % 86400. But if we were to express times before 1970 using negative numbers, the "truncate tow...
Reset C int array to zero : the fastest way?
...rwritten using pointer arithmetics ((float *)((a)+x)). The two intrinsics (starting with _mm256) just create a zero-initialized 32byte register and store it to the current pointer. This are the first 3 lines. The rest just handles all special cases where the last 32byte block shouldn't be fully over...
What is the difference between JSF, Servlet and JSP?
...th taglibs.
When a JSP is requested for the first time or when the web app starts up, the servlet container will compile it into a class extending HttpServlet and use it during the web app's lifetime. You can find the generated source code in the server's work directory. In for example Tomcat, it's ...