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Showing content from https://developer.mozilla.org/en-US/docs/Web/API/URLPattern/exec below:

URLPattern: exec() method - Web APIs

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The exec() method of the URLPattern interface takes a URL or object of URL parts, and returns either an object containing the results of matching the URL to the pattern, or null if the URL does not match the pattern.

exec(input)
exec(input, baseURL)

input

The URL or URL parts to match against. This can either be a string, or an object providing the individual URL parts. The object members can be any of protocol, username, password, hostname, port, pathname, search, hash, or baseURL. Omitted parts in the object will be treated as empty strings. If the input cannot be parsed, or a relative URL without a base is provided, the method will return null.

baseURL Optional

A string representing the base URL to use in cases where input is a relative URL. If not specified, it defaults to undefined. If this parameter cannot be parsed, the method will return null.

An object with an inputs key containing the array of arguments passed into the function, and keys for each of the URL parts containing the matched input, and matched groups for that part.

This example shows how to use the exec() method to match a URL against a pattern. The example prints the result of the exec() calls to the console.

const pattern = new URLPattern("http{s}?://*.example.com/books/:id");

// Absolute URL strings
console.log(pattern.exec("https://example.com/books/123")); // null
let match = pattern.exec("https://store.example.com/books/123");
console.log(match.inputs); // ['https://store.example.com/books/123']
console.log(match.protocol); // { input: "https", groups: {} }
console.log(match.username); // { input: "", groups: {} }
console.log(match.password); // { input: "", groups: {} }
console.log(match.hostname); // { input: "store.example.com", groups: { "0": "store" } }
console.log(match.port); // { input: "", groups: {} }
console.log(match.pathname); // { input: "/books/123", groups: { "id": "123" } }
console.log(match.search); // { input: "", groups: {} }
console.log(match.hash); // { input: "", groups: {} }

// Relative URL strings
pattern.exec("/books/123", "http://store.example.com"); // returns object
pattern.exec("/books/123", "data:text/plain,hello world!"); // returns object
pattern.exec("/books/123"); // returns null

// Structured objects
pattern.exec({
  pathname: "/books/123",
  baseURL: "http://store.example.com",
}); // returns object
pattern.exec({
  protocol: "https",
  hostname: "store.example.com",
  pathname: "/books/123",
}); // returns object
pattern.exec({
  protocol: "file",
  hostname: "store.example.com",
  pathname: "/books/123",
}); // returns null

• A polyfill of URLPattern is available on GitHub

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