Javascript pattern matching9/4/2023 ![]() ![]() ![]() Its goal is to standardize a routing pattern syntax, including support for wildcards, named token groups, regular expression groups, and group modifiers. URLPattern is an addition to the web platform that builds on the foundation created by these frameworks. Popular server-side frameworks like Express and Ruby on Rails use this syntax (or something very close to it), and JavaScript developers can use modules like path-to-regexp or regexpparam to add that logic to their own code. While there is no one definitive standard, web developers have gravitated towards a common syntax for expressing URL routing patterns that share a lot in common with regular expressions, but with some domain-specific additions like tokens for matching path segments. Routing might be implemented in a number of ways: it's sometimes code running on a server that maps a path to files on disk, or logic in a single-page app that waits for changes to the current location and creates a corresponding piece of DOM to display. At its heart, routing involves taking a URL, applying some pattern matching or other app-specific logic to it, and then, usually, displaying web content based on the result. Routing is a key piece of every web application.
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