Viewing github.com/alecthomas/chroma/lexers/embedded/diff.xml

```
<lexer>
```
```
  <config>
```
```
    <name>Diff</name>
```
```
    <alias>diff</alias>
```
```
    <alias>udiff</alias>
```
```
    <filename>*.diff</filename>
```
```
    <filename>*.patch</filename>
```
```
    <mime_type>text/x-diff</mime_type>
```

    <mime_type>text/x-patch</mime_type>

```
    <ensure_nl>true</ensure_nl>
```
```
  </config>
```
```
  <rules>
```
```
    <state name="root">
```
```
      <rule pattern=" .*\n">
```
```
        <token type="Text"/>
```
```
      </rule>
```

      <rule pattern="\d+(,\d+)?(a|c|d)\d+(,\d+)?\n">

        <token type="GenericSubheading"/>

```
      </rule>
```
```
      <rule pattern="---\n">
```
```
        <token type="GenericStrong"/>
```
```
      </rule>
```
```
      <rule pattern="&lt; .*\n">
```
```
        <token type="GenericDeleted"/>
```
```
      </rule>
```
```
      <rule pattern="&gt; .*\n">
```

        <token type="GenericInserted"/>

```
      </rule>
```
```
      <rule pattern="\+.*\n">
```

        <token type="GenericInserted"/>

```
      </rule>
```
```
      <rule pattern="-.*\n">
```
```
        <token type="GenericDeleted"/>
```
```
      </rule>
```
```
      <rule pattern="!.*\n">
```
```
        <token type="GenericStrong"/>
```
```
      </rule>
```
```
      <rule pattern="@.*\n">
```

        <token type="GenericSubheading"/>

```
      </rule>
```

      <rule pattern="([Ii]ndex|diff).*\n">

```
        <token type="GenericHeading"/>
```
```
      </rule>
```
```
      <rule pattern="=.*\n">
```
```
        <token type="GenericHeading"/>
```
```
      </rule>
```
```
      <rule pattern=".*\n">
```
```
        <token type="Text"/>
```
```
      </rule>
```
```
    </state>
```
```
  </rules>
```
```
</lexer>
```

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