Match patterns

A match pattern is a URL with the following structure, used to specify a group of URLs:

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

scheme: Must be one of the following, separated from the rest of the pattern using a colon followed by a double slash (://):

http
https
A wildcard *, which matches only http or https
file

For information on injecting content scripts into unsupported schemes, such as about: and data:, see Injecting in related frames.

host: A hostname (www.example.com). A * before the hostname to match subdomains (*.example.com), or just a wildcard *. - If you use a wildcard in the host pattern, it must be the first or only character, and it must be followed by a period (.) or forward slash (/).

path: A URL path (/example). For host permissions, the path is required but ignored. The wildcard (/*) should be used by convention.

Extensions use match patterns in a variety of use cases, including the following:

Injecting content script.
Declaring host permissions that some Chrome APIs require in addition to their own permissions.
Granting access to web-accessible resources.
Allowing message sending and receiving using the "externally_connectable.matches" manifest key.

Special cases

"<all_urls>": Matches any URL that starts with a permitted scheme, including any pattern listed under valid patterns. Because it affects all hosts, Chrome web store reviews for extensions that use it may take longer.
"file:///": Allows your extension to run on local files. This pattern requires the user to manually grant access. Note that this case requires three slashes, not two.
Localhost URLs and IP addresses: To match any localhost port during development, use http://localhost/*. For IP addresses, specify the address plus a wildcard in the path, as in http://127.0.0.1/*. You can also use http://*:*/* to match localhost, IP addresses, and any port.
Top Level domain match patterns: Chrome doesn't support match patterns for top Level domains (TLD). Specify your match patterns within individual TLDs, as in http://google.es/* and http://google.fr/*.

Example patterns

https://*/* or https://*/: Matches any URL using the https scheme.
https://*/foo*: Matches any URL using the https scheme, on any host, with a path that starts with foo. Examples of matches include https://example.com/foo/bar.html and https://www.google.com/foo.
https://*.google.com/foo*bar: Matches any URL using the https scheme, on a google.com host, with a path that starts with foo and ends with bar. Examples of matches include https://www.google.com/foo/baz/bar and https://docs.google.com/foobar.
file:///foo*: Matches any local file whose path starts with foo. Examples of matches include file:///foo/bar.html and file:///foo.
http://127.0.0.1/* or http://127.0.0.1/: Matches any URL that uses the http scheme and is on the host 127.0.0.1. Examples of matches include http://127.0.0.1/ and http://127.0.0.1/foo/bar.html.
http://localhost/*: Matches any localhost port.
*://mail.google.com/ or *://mail.google.com/*: Matches any URL that starts with http://mail.google.com or https://mail.google.com.