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Using Regular Expressions to Extract a Value in Java
.../ create matcher for pattern p and given string
Matcher m = p.matcher("Testing123Testing");
// if an occurrence if a pattern was found in a given string...
if (m.find()) {
// ...then you can use group() methods.
System.out.println(m.group(0)); // whole matched expression...
How to determine whether an object has a given property in JavaScript
...
Object has property:
If you are testing for properties that are on the object itself (not a part of its prototype chain) you can use .hasOwnProperty():
if (x.hasOwnProperty('y')) {
// ......
}
Object or its prototype has a property:
You can use the i...
Implement touch using Python?
...
Here's some code that uses ctypes (only tested on Linux):
from ctypes import *
libc = CDLL("libc.so.6")
# struct timespec {
# time_t tv_sec; /* seconds */
# long tv_nsec; /* nanoseconds */
# };
# int futimens(int fd...
What does -D_XOPEN_SOURCE do/mean?
...age for each function you call.
For example, man strdup says:
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
strdup(): _SVID_SOURCE || _BSD_SOURCE || _XOPEN_SOURCE >= 500
strndup(), strdupa(), strndupa(): _GNU_SOURCE
Which means that you should put o...
What's the algorithm to calculate aspect ratio?
...oat:1 solution like 1.77778:1.
If so, what you need to do is find the greatest common divisor (GCD) and divide both values by that. The GCD is the highest number that evenly divides both numbers. So the GCD for 6 and 10 is 2, the GCD for 44 and 99 is 11.
For example, a 1024x768 monitor has a GCD o...
How do I test a private function or a class that has private methods, fields or inner classes?
How do I unit test (using xUnit) a class that has internal private methods, fields or nested classes? Or a function that is made private by having internal linkage ( static in C/C++) or is in a private ( anonymous ) namespace?
...
One-liner to recursively list directories in Ruby?
What is the fastest, most optimized, one-liner way to get an array of the directories (excluding files) in Ruby?
9 Answer...
When to use static vs instantiated classes
...
One thing about static methods/classes is that they don't facilitate unit testing (at least in PHP, but probably in other languages too).
Another thing about static data is that only one instance of it exists in your program : if you set MyClass::$myData to some value somewhere, it'll have this va...
Django : How can I see a list of urlpatterns?
...
Django >= 2.0 solution
I tested the other answers in this post and they were either not working with Django 2.X, incomplete or too complex. Therefore, here is my take on this:
from django.conf import settings
from django.urls import URLPattern, URLR...
Node.js get file extension
...ion that check the extension. WHY? because what about files like jone.lastTest.654654556.tar.gz here the extension that's expected is tar.gz but if you apply any function that give form 1st dot, it will not work as you can see
– Mohamed Allal
Feb 14 '18 at 2...