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What is a Regular Expression (regex)? A practical guideA regular expression (regex or regexp) is a sequence of characters that forms a search pattern for matching and manipulating text. Built on a formal mathematical foundation and common to almost every programming language and tool, regex lets you validate input, find and replace text, extract data, and transform strings with a compact, declarative syntax. This guide explains what regex is, its core syntax, how it is implemented, and how to use it safely.Open source licenses explained: MIT, Apache, and GPL comparedOpen source licenses decide how others can use, modify, and distribute your code. This guide explains permissive licenses (MIT, Apache 2.0), copyleft licenses (GPL, AGPL), and how to choose the right one for your project. 