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path-to-regexp
Advanced tools
The path-to-regexp package is a utility for converting paths to and from regular expressions. It is commonly used for routing in web applications, allowing developers to define patterns for URL paths and extract parameters from them.
Path to RegExp Conversion
Convert a path string into a regular expression. It can also extract named parameter keys.
const { pathToRegexp } = require('path-to-regexp');
const keys = [];
const regexp = pathToRegexp('/user/:id', keys);
Extracting Parameters from a Path
Match a path against a pattern and extract the named parameters.
const { match } = require('path-to-regexp');
const matchFn = match('/user/:id');
const result = matchFn('/user/123');
// result.params will contain the extracted parameters
Compile Path to String
Compile a path function from a string pattern, which can then be used to construct paths with parameters.
const { compile } = require('path-to-regexp');
const toPath = compile('/user/:id');
const path = toPath({ id: 123 });
// path will be '/user/123'
Express is a web application framework for Node.js that includes its own routing capabilities, which are similar to path-to-regexp. Express uses path-to-regexp internally for its routing logic.
React Router is a routing library for React that uses path-to-regexp-like pattern matching for defining routes and extracting parameters, but it is specifically tailored for React applications.
url-pattern is another library for matching URLs against patterns and extracting parameters. It offers a similar API to path-to-regexp but with different syntax and additional options for pattern matching.
Turn an Express-style path string such as /user/:name
into a regular expression.
Note: This is a legacy branch. You should upgrade to 1.x
.
var pathToRegexp = require('path-to-regexp');
var keys = [];
var exp = pathToRegexp('/foo/:bar', keys);
//keys = ['bar']
//exp = /^\/foo\/(?:([^\/]+?))\/?$/i
You can see a live demo of this library in use at express-route-tester.
MIT
FAQs
Express style path to RegExp utility
The npm package path-to-regexp receives a total of 62,336,932 weekly downloads. As such, path-to-regexp popularity was classified as popular.
We found that path-to-regexp demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 5 open source maintainers collaborating on the project.
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