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

```
<lexer>
```
```
  <config>
```
```
    <name>Cheetah</name>
```
```
    <alias>cheetah</alias>
```
```
    <alias>spitfire</alias>
```
```
    <filename>*.tmpl</filename>
```
```
    <filename>*.spt</filename>
```

    <mime_type>application/x-cheetah</mime_type>

    <mime_type>application/x-spitfire</mime_type>

```
  </config>
```
```
  <rules>
```
```
    <state name="root">
```
```
      <rule pattern="(##[^\n]*)$">
```
```
        <bygroups>
```
```
          <token type="Comment"/>
```
```
        </bygroups>
```
```
      </rule>
```

      <rule pattern="#[*](.|\n)*?[*]#">

```
        <token type="Comment"/>
```
```
      </rule>
```

      <rule pattern="#end[^#\n]*(?:#|$)">

```
        <token type="CommentPreproc"/>
```
```
      </rule>
```
```
      <rule pattern="#slurp$">
```
```
        <token type="CommentPreproc"/>
```
```
      </rule>
```

      <rule pattern="(#[a-zA-Z]+)([^#\n]*)(#|$)">

```
        <bygroups>
```

          <token type="CommentPreproc"/>

```
          <using lexer="Python"/>
```

          <token type="CommentPreproc"/>

```
        </bygroups>
```
```
      </rule>
```

      <rule pattern="(\$)([a-zA-Z_][\w.]*\w)">

```
        <bygroups>
```

          <token type="CommentPreproc"/>

```
          <using lexer="Python"/>
```
```
        </bygroups>
```
```
      </rule>
```

      <rule pattern="(\$\{!?)(.*?)(\})(?s)">

```
        <bygroups>
```

          <token type="CommentPreproc"/>

```
          <using lexer="Python"/>
```

          <token type="CommentPreproc"/>

```
        </bygroups>
```
```
      </rule>
```

      <rule pattern="(?sx)&#xA;                (.+?)               # anything, followed by:&#xA;                (?:&#xA;                 (?=\#[#a-zA-Z]*) | # an eval comment&#xA;                 (?=\$[a-zA-Z_{]) | # a substitution&#xA;                 \Z                 # end of string&#xA;                )&#xA;            ">

```
        <token type="Other"/>
```
```
      </rule>
```
```
      <rule pattern="\s+">
```
```
        <token type="Text"/>
```
```
      </rule>
```
```
    </state>
```
```
  </rules>
```
```
</lexer>
```