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<li><a href="manifest.html">Manifest Files</a></li>
<li class="leftNavSelected">Match Patterns</li>
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<h1 class="page_title">Match Patterns</h1>
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<div id="static"><div id="pageData-name" class="pageData">Match Patterns</div>
<p>
<a href="content_scripts.html">Content scripts</a> operate on
a set of URLs defined by match patterns.
You can put one or more match patterns
in the <code>"matches"</code> part of
a content script's section of the manifest.
This page describes the match pattern syntax —
the rules you need to follow when you specify
which URLs your content script affects.
</p>
<p>
A match pattern is essentially a URL
that begins with <code>http</code>, <code>https</code>,
<code>file</code>, or <code>ftp</code>,
and that can contain '<code>*</code>' characters.
Each match pattern has 3 parts:</p>
<p></p>
<ul>
<li> <em>scheme</em> —
for example, <code>http</code> or <code>file</code>
</li>
<li> <em>host</em> —
for example, <code>www.google.com</code>
or <code>*.google.com</code>
or <code>*</code>;
if the scheme is <code>file</code>,
there is no <em>host</em> part
</li>
<li> <em>path</em> —
for example, <code>/*</code>, <code>/foo* </code>,
or <code>/foo/bar </code>
</li>
</ul>
<p>Here's the basic syntax:</p>
<pre><em><url-pattern></em> := <em><scheme></em>://<em><host></em><em><path></em><br><em><scheme></em> := 'http' | 'https' | 'file' | 'ftp'<br><em><host></em> := '*' | '*.' <em><any char except '/' and '*'></em>+<br><em><path></em> := '/' <em><any chars></em></pre>
<p>
The meaning of '<code>*</code>' depends on whether
it's in the <em>host</em> or the <em>path</em> part.
If the <em>host</em> is just <code>*</code>,
then it matches any host.
If the <em>host</em> is <code>*.<em>hostname</em></code>,
then it matches the specified host or any of its subdomains.
In the <em>path</em> section,
each '<code>*</code>' matches 0 or more characters.
The following table shows some valid patterns.
</p>
<table class="columns">
<tbody>
<tr>
<th style="margin-left:0; padding-left:0">Pattern</th>
<th style="margin-left:0; padding-left:0">What it does</th>
<th style="margin-left:0; padding-left:0">Examples of matching URLs</th>
</tr>
<tr>
<td>
<code>http://*/*</code>
</td>
<td>Matches any URL that uses the <code>http</code> scheme</td>
<td>
http://www.google.com/<br>
http://example.org/foo/bar.html
</td>
</tr>
<tr>
<td>
<code>http://*/foo*</code>
</td>
<td>
Matches any URL that uses the <code>http</code> scheme, on any host,
as long as the path starts with <code>/foo</code>
</td>
<td>
http://example.com/foo/bar.html<br>
http://www.google.com/foo<b></b>
</td>
</tr>
<tr>
<td>
<code>https://*.google.com/foo*bar </code>
</td>
<td>
Matches any URL that uses the <code>https</code> scheme,
is on a google.com host
(such as www.google.com, docs.google.com, or google.com),
as long as the path starts with <code>/foo</code>
and ends with <code>bar</code>
</td>
<td>
http://www.google.com/foo/baz/bar<br>
http://docs.google.com/foobar
</td>
</tr>
<tr>
<td>
<code>http://example.org/foo/bar.html </code>
</td>
<td>Matches the specified URL</td>
<td>
http://example.org/foo/bar.html
</td>
</tr>
<tr>
<td>
<code>file:///foo*</code>
</td>
<td>Matches any local file whose path starts with <code>/foo</code></td>
<td>
file:///foo/bar.html<br>
file:///foo
</td>
</tr>
<tr>
<td>
<code>http://127.0.0.1/*</code>
</td>
<td>
Matches any URL that uses the <code>http</code> scheme
and is on the host 127.0.0.1
</td>
<td>
http://127.0.0.1/<br>
http://127.0.0.1/foo/bar.html
</td>
</tr>
</tbody>
</table>
<p>
Here are some examples of <em>invalid</em> pattern matches:
</p>
<table class="columns">
<tbody>
<tr>
<th style="margin-left:0; padding-left:0">Bad pattern</th>
<th style="margin-left:0; padding-left:0">Why it's bad</th>
</tr>
<tr>
<td><code>http://*</code></td>
<td>No <em>path</em></td>
</tr>
<tr>
<td><code>http://*foo/bar</code></td>
<td>'*' in the <em>host</em> can be followed only by a '.' or '/'</td>
</tr>
<tr>
<td><code>http://foo.*.bar/baz </code></td>
<td>If '*' is in the <em>host</em>, it must be the first character</td>
</tr>
<tr>
<td><code>http:/bar</code></td>
<td>Missing <em>scheme</em> separator ("/" should be "//")</td>
</tr>
<tr>
<td><code>foo://*</code></td>
<td>Invalid <em>scheme</em></td>
</tr>
</tbody>
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