Tutorial by Examples: all

preg_replace_callback works by sending every matched capturing group to the defined callback and replaces it with the return value of the callback. This allows us to replace strings based on any kind of logic. $subject = "He said 123abc, I said 456efg, then she said 789hij"; $regex = &q...

The trick is to use a look-behind with the regex \G, which means "end of previous match": String[] parts = str.split("(?<=\\G.{8})"); The regex matches 8 characters after the end of the last match. Since in this case the match is zero-width, we could more simply say "...

Same as the known length example, but insert the length into regex: int length = 5; String[] parts = str.split("(?<=\\G.{" + length + "})");

The authentic Adobe PostScript interpreters are available in high-end printers, the Display PostScript (DPS) product, and the Acrobat Distiller product. As authors of the standard, these products are considered "the standard implementation" for the purpose of describing differences among P...

There different flavors of DB2. One of them is LUW: Linux, UNIX and Windows. DB2 LUW in Linux / UNIX can be installed with or without root. When installed with root, you can create different instances associating them to different users. When installing DB2 LUW without root privileges, you can ins...

Detailed instructions on getting lxml set up or installed.

Detailed instructions on getting titanium set up or installed.

Detailed instructions on getting cdi set up or installed.

One of the more annoying things that programmers can do is to scatter calls to printStackTrace() throughout their code. The problem is that the printStackTrace() is going to write the stacktrace to standard output. For an application that is intended for end-users who are not Java programmers,...

You can see list with all environment variables with: Get-Childitem env:

$env:COMPUTERNAME

Node.js npm install bluebird Then: var Promise = require("bluebird"); Browsers There are many ways to use bluebird in browsers: Direct downloads Full build bluebird.js Full build minified bluebird.min.js Core build bluebird.core.js Core build minified bluebird.core.min.js...

Detailed instructions on getting jsf-2 set up or installed. Requirements: JDK 1.6+ Java Servlet 2.5 Installing jsf-2 on Tomcat Installing jsf-2 on Glassfish

To install Cucumber for use with Ruby simply use the command gem install cucumber Alternatively, if you are using bundler, you can add the following line to your Gemfile gem 'cucumber' And then run bundler bundle install [I think this belongs in its own topic, Installation. I created tha...

Consider these two pieces of code: int a = 1000; int b = a + 1; and Integer a = 1000; Integer b = a + 1; Question: Which version is more efficient? Answer: The two versions look almost the identical, but the first version is a lot more efficient than the second one. The second version is...

Tableau offers a 2 week free trial for all of their licensed products. Tableau also offers licenses to Students for free here and nearly free Desktop licenses for non-profit organizations here. To get started with a free trial, navigate to Tableau Products to see a list of their offerings which inc...

Detailed instructions on getting nopcommerce set up or installed.

The following example code is slower than it needs to be : Map<String, String> map = new HashMap<>(); for (String key : map.keySet()) { String value = map.get(key); // Do something with key and value } That is because it requires a map lookup (the get() method) for each ...

The Java Collections Framework provides two related methods for all Collection objects: size() returns the number of entries in a Collection, and isEmpty() method returns true if (and only if) the Collection is empty. Both methods can be used to test for collection emptiness. For example: C...

In order to convert any callback API to promises assuming the promisify and promisifyAll version doesn't fit - you can use the promise constructor. Creating promises generally means specifying when they settle - that means when they move to the fulfilled (completed) or rejected (errored) phase to i...