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

```
<lexer>
```
```
  <config>
```
```
    <name>Mason</name>
```
```
    <alias>mason</alias>
```
```
    <filename>*.m</filename>
```
```
    <filename>*.mhtml</filename>
```
```
    <filename>*.mc</filename>
```
```
    <filename>*.mi</filename>
```
```
    <filename>autohandler</filename>
```
```
    <filename>dhandler</filename>
```

    <mime_type>application/x-mason</mime_type>

```
    <priority>0.1</priority>
```
```
  </config>
```
```
  <rules>
```
```
    <state name="root">
```
```
      <rule pattern="\s+">
```
```
        <token type="Text"/>
```
```
      </rule>
```

      <rule pattern="(&lt;%doc&gt;)(.*?)(&lt;/%doc&gt;)(?s)">

```
        <bygroups>
```
```
          <token type="NameTag"/>
```

          <token type="CommentMultiline"/>

```
          <token type="NameTag"/>
```
```
        </bygroups>
```
```
      </rule>
```

      <rule pattern="(&lt;%(?:def|method))(\s*)(.*?)(&gt;)(.*?)(&lt;/%\2\s*&gt;)(?s)">

```
        <bygroups>
```
```
          <token type="NameTag"/>
```
```
          <token type="Text"/>
```
```
          <token type="NameFunction"/>
```
```
          <token type="NameTag"/>
```
```
          <usingself state="root"/>
```
```
          <token type="NameTag"/>
```
```
        </bygroups>
```
```
      </rule>
```

      <rule pattern="(&lt;%\w+)(.*?)(&gt;)(.*?)(&lt;/%\2\s*&gt;)(?s)">

```
        <bygroups>
```
```
          <token type="NameTag"/>
```
```
          <token type="NameFunction"/>
```
```
          <token type="NameTag"/>
```
```
          <using lexer="Perl"/>
```
```
          <token type="NameTag"/>
```
```
        </bygroups>
```
```
      </rule>
```

      <rule pattern="(&lt;&amp;[^|])(.*?)(,.*?)?(&amp;&gt;)(?s)">

```
        <bygroups>
```
```
          <token type="NameTag"/>
```
```
          <token type="NameFunction"/>
```
```
          <using lexer="Perl"/>
```
```
          <token type="NameTag"/>
```
```
        </bygroups>
```
```
      </rule>
```

      <rule pattern="(&lt;&amp;\|)(.*?)(,.*?)?(&amp;&gt;)(?s)">

```
        <bygroups>
```
```
          <token type="NameTag"/>
```
```
          <token type="NameFunction"/>
```
```
          <using lexer="Perl"/>
```
```
          <token type="NameTag"/>
```
```
        </bygroups>
```
```
      </rule>
```
```
      <rule pattern="&lt;/&amp;&gt;">
```
```
        <token type="NameTag"/>
```
```
      </rule>
```

      <rule pattern="(&lt;%!?)(.*?)(%&gt;)(?s)">

```
        <bygroups>
```
```
          <token type="NameTag"/>
```
```
          <using lexer="Perl"/>
```
```
          <token type="NameTag"/>
```
```
        </bygroups>
```
```
      </rule>
```

      <rule pattern="(?&lt;=^)#[^\n]*(\n|\Z)">

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

      <rule pattern="(?&lt;=^)(%)([^\n]*)(\n|\Z)">

```
        <bygroups>
```
```
          <token type="NameTag"/>
```
```
          <using lexer="Perl"/>
```
```
          <token type="Other"/>
```
```
        </bygroups>
```
```
      </rule>
```

      <rule pattern="(?sx)&#xA;                 (.+?)               # anything, followed by:&#xA;                 (?:&#xA;                  (?&lt;=\n)(?=[%#]) |  # an eval or comment line&#xA;                  (?=&lt;/?[%&amp;]) |      # a substitution or block or&#xA;                                     # call start or end&#xA;                                     # - don&#39;t consume&#xA;                  (\\\n) |           # an escaped newline&#xA;                  \Z                 # end of string&#xA;                 )">

```
        <bygroups>
```
```
          <using lexer="HTML"/>
```
```
          <token type="Operator"/>
```
```
        </bygroups>
```
```
      </rule>
```
```
    </state>
```
```
  </rules>
```
```
</lexer>
```