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Showing content from https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/Match_patterns below:

Match patterns - Mozilla | MDN

Match patterns are a way to specify groups of URLs: a match pattern matches a specific set of URLs. They are used in WebExtensions APIs in a few places, most notably to specify which documents to load content scripts into, and to specify which URLs to add webRequest listeners to.

APIs that use match patterns usually accept a list of match patterns, and will perform the appropriate action if the URL matches any of the patterns. See, for example, the content_scripts key in manifest.json.

Note: Some browsers don't support certain schemes. Check the Browser compatibility table for details.

All match patterns are specified as strings. Apart from the special <all_urls> pattern, match patterns consist of three parts: scheme, host, and path. The scheme and host are separated by ://.

<scheme>://<host><path>

The scheme component may take one of two forms:

The host component may take one of three forms:

host must not include a port number.

host is optional only if the scheme is "file".

Note that the wildcard may only appear at the start.

The path component must begin with a /.

After that, it may subsequently contain any combination of the * wildcard and any of the characters that are allowed in URL paths or query strings. Unlike host, the path component may contain the * wildcard in the middle or at the end, and the * wildcard may appear more than once.

The value for the path matches against the string which is the URL path plus the URL query string. This includes the ? between the two, if the query string is present in the URL. For example, if you want to match URLs on any domain where the URL path ends with foo.bar, then you need to use an array of Match Patterns like ["*://*/*foo.bar", "*://*/*foo.bar?*"]. The ?* is needed, rather than just bar*, in order to anchor the ending * as applying to the URL query string and not some portion of the URL path.

Neither the URL fragment identifier, nor the # which precedes it, are considered as part of the path.

Note: The path pattern string should not include a port number. Adding a port, as in: http://localhost:1234/* causes the match pattern to be ignored. However, http://localhost:1234 will match with http://localhost/*.

The special value <all_urls> matches all URLs under any of the supported schemes: that is "http", "https", "ws", "wss", "ftp", "data", and "file".

<all_urls>

Match all URLs.

http://example.org/

https://a.org/some/path/

ws://sockets.somewhere.org/

wss://ws.example.com/stuff/

ftp://files.somewhere.org/

resource://a/b/c/
(unsupported scheme)

ftps://files.somewhere.org/
(unsupported scheme)

*://*/*

Match all HTTP, HTTPS and WebSocket URLs.

http://example.org/

https://a.org/some/path/

ws://sockets.somewhere.org/

wss://ws.example.com/stuff/

ftp://ftp.example.org/
(unmatched scheme)

file:///a/
(unmatched scheme)

*://*.mozilla.org/*

Match all HTTP, HTTPS and WebSocket URLs that are hosted at "mozilla.org" or one of its subdomains.

http://mozilla.org/

https://mozilla.org/

http://a.mozilla.org/

http://a.b.mozilla.org/

https://b.mozilla.org/path/

ws://ws.mozilla.org/

wss://secure.mozilla.org/something

ftp://mozilla.org/
(unmatched scheme)

http://mozilla.com/
(unmatched host)

http://firefox.org/
(unmatched host)

*://mozilla.org/

Match all HTTP, HTTPS and WebSocket URLs that are hosted at exactly "mozilla.org/".

http://mozilla.org/

https://mozilla.org/

ws://mozilla.org/

wss://mozilla.org/

ftp://mozilla.org/
(unmatched scheme)

http://a.mozilla.org/
(unmatched host)

http://mozilla.org/a
(unmatched path)

ftp://mozilla.org/

Match only "ftp://mozilla.org/".

http://mozilla.org/
(unmatched scheme)

ftp://sub.mozilla.org/
(unmatched host)

ftp://mozilla.org/path
(unmatched path)

https://*/path

Match HTTPS URLs on any host, whose path is "path".

https://mozilla.org/path

https://a.mozilla.org/path

https://something.com/path

http://mozilla.org/path
(unmatched scheme)

https://mozilla.org/path/
(unmatched path)

https://mozilla.org/a
(unmatched path)

https://mozilla.org/
(unmatched path)

https://mozilla.org/path?foo=1
(unmatched path due to URL query string)

https://*/path/

Match HTTPS URLs on any host, whose path is "path/" and which has no URL query string.

https://mozilla.org/path/

https://a.mozilla.org/path/

https://something.com/path/

http://mozilla.org/path/
(unmatched scheme)

https://mozilla.org/path
(unmatched path)

https://mozilla.org/a
(unmatched path)

https://mozilla.org/
(unmatched path)

https://mozilla.org/path/?foo=1
(unmatched path due to URL query string)

https://mozilla.org/*

Match HTTPS URLs only at "mozilla.org", with any URL path and URL query string.

https://mozilla.org/

https://mozilla.org/path

https://mozilla.org/another

https://mozilla.org/path/to/doc

https://mozilla.org/path/to/doc?foo=1

http://mozilla.org/path
(unmatched scheme)

https://mozilla.com/path
(unmatched host)

https://mozilla.org/a/b/c/

Match only this URL, or this URL with any URL fragment.

https://mozilla.org/a/b/c/

https://mozilla.org/a/b/c/#section1

https://mozilla.org/*/b/*/

Match HTTPS URLs hosted on "mozilla.org", whose path contains a component "b" somewhere in the middle. Will match URLs with query strings, if the string ends in a /.

https://mozilla.org/a/b/c/

https://mozilla.org/d/b/f/

https://mozilla.org/a/b/c/d/

https://mozilla.org/a/b/c/d/#section1

https://mozilla.org/a/b/c/d/?foo=/

https://mozilla.org/a?foo=21314&bar=/b/&extra=c/

https://mozilla.org/b/*/
(unmatched path)

https://mozilla.org/a/b/
(unmatched path)

https://mozilla.org/a/b/c/d/?foo=bar
(unmatched path due to URL query string)

file:///blah/*

Match any FILE URL whose path begins with "blah".

file:///blah/

file:///blah/bleh

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