URLPattern: hasRegExpGroups property
Baseline
2025
Newly available
Since September 2025, this feature works across the latest devices and browser versions. This feature might not work in older devices or browsers.
Note: This feature is available in Web Workers.
The hasRegExpGroups read-only property of the URLPattern interface is a boolean indicating whether or not any of the URLPattern components contain regular expression capturing groups.
You can use the hasRegExpGroups property to check if a URLPattern object is usable with certain web platform APIs which do not allow regular expression capturing groups. For example:
- The
matchdirective in theUse-As-DictionaryHTTP header prohibits regular expression capturing groups, as well as - the
urlPatterncondition when adding static routes using theInstallEvent.addRoutes()method.
Value
A boolean.
Examples
Using hasRegExpGroups
In the following example, a URLPattern object is used with a group delimiter containing named capturing groups called "id" and "title". The hasRegExpGroups property returns true in this case.
const pattern = new URLPattern({ pathname: "/blog/:id(\\d+){-:title}?" });
console.log(pattern.hasRegExpGroups); // true
const result = pattern.exec({ pathname: "/blog/123-some-article" });
console.log(result.pathname.groups); // {id: '123', title: 'some-article'}
It also works with anonymous capturing groups.
const pattern = new URLPattern({ pathname: "/blog/(\\d+)" });
console.log(pattern.hasRegExpGroups); // true
const result = pattern.exec({ pathname: "/blog/123" });
console.log(result.pathname.groups); // {0: '123'}
For other non-capturing groups, for example when using wildcard tokes (*), hasRegExpGroups will return false.
const pattern = new URLPattern({ pathname: "/blog/*" });
console.log(pattern.hasRegExpGroups); // false
const result = pattern.exec({ pathname: "/blog/123" });
console.log(result.pathname.groups); // {0: '123'}
Specifications
| Specification |
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| URL Pattern # dom-urlpattern-hasregexpgroups |
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