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

```
<lexer>
```
```
  <config>
```
```
    <name>Sieve</name>
```
```
    <alias>sieve</alias>
```
```
    <filename>*.siv</filename>
```
```
    <filename>*.sieve</filename>
```
```
  </config>
```
```
  <rules>
```
```
    <state name="root">
```
```
      <rule pattern="\s+">
```
```
        <token type="Text"/>
```
```
      </rule>
```
```
      <rule pattern="[();,{}\[\]]">
```
```
        <token type="Punctuation"/>
```
```
      </rule>
```
```
      <rule pattern="(?i)require">
```

        <token type="KeywordNamespace"/>

```
      </rule>
```

      <rule pattern="(?i)(:)(addresses|all|contains|content|create|copy|comparator|count|days|detail|domain|fcc|flags|from|handle|importance|is|localpart|length|lowerfirst|lower|matches|message|mime|options|over|percent|quotewildcard|raw|regex|specialuse|subject|text|under|upperfirst|upper|value)">

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

      <rule pattern="(?i)(address|addflag|allof|anyof|body|discard|elsif|else|envelope|ereject|exists|false|fileinto|if|hasflag|header|keep|notify_method_capability|notify|not|redirect|reject|removeflag|setflag|size|spamtest|stop|string|true|vacation|virustest)">

```
        <token type="NameBuiltin"/>
```
```
      </rule>
```
```
      <rule pattern="(?i)set">
```

        <token type="KeywordDeclaration"/>

```
      </rule>
```

      <rule pattern="([0-9.]+)([kmgKMG])?">

```
        <bygroups>
```

          <token type="LiteralNumber"/>

          <token type="LiteralNumber"/>

```
        </bygroups>
```
```
      </rule>
```
```
      <rule pattern="#.*$">
```
```
        <token type="CommentSingle"/>
```
```
      </rule>
```
```
      <rule pattern="/\*.*\*/">
```

        <token type="CommentMultiline"/>

```
      </rule>
```

      <rule pattern="&#34;[^&#34;]*?&#34;">

```
        <token type="LiteralString"/>
```
```
      </rule>
```
```
      <rule pattern="text:">
```
```
        <token type="NameTag"/>
```
```
        <push state="text"/>
```
```
      </rule>
```
```
    </state>
```
```
    <state name="text">
```
```
      <rule pattern="[^.].*?\n">
```
```
        <token type="LiteralString"/>
```
```
      </rule>
```
```
      <rule pattern="^\.">
```
```
        <token type="Punctuation"/>
```
```
        <pop depth="1"/>
```
```
      </rule>
```
```
    </state>
```
```
  </rules>
```
```
</lexer>
```