The built-in JavaScript regular expression engine can, under certain special combinations, run in exponential time. This situation can trigger what's referred to as a Regular Expression Denial of ...

Abstract: Regular expressions are notoriously difficult to get right, with developers often having to resort to trial-and-error approaches. Even so, little attention ...

Regex (very incomplete) implementation in pure Python. Only intended to illustrate the related concepts in a simple way, hopefully. As part of what I call the "How it's made - Software edition" ...

If you use Excel 40 hours a week (and those are the weeks you are on vacation), welcome to the MrExcel channel. Home to 2,400 free Excel tutorials. Bill "MrExcel" Jelen is the author of 67 books about ...

Functional programming, as the name implies, is about functions. While functions are part of just about every programming paradigm, including JavaScript, a functional programmer has unique ...

An experimental ‘no-GIL’ build mode in Python 3.13 disables the Global Interpreter Lock to enable true parallel execution in Python. Here’s where to start. The single biggest new feature in Python ...

Escape the single-threaded event loop in browsers and on the server. Here's how to use worker threads and web workers for modern multithreading in JavaScript. The JavaScript language is one of the ...