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

```
<lexer>
```
```
  <config>
```
```
    <name>Tcsh</name>
```
```
    <alias>tcsh</alias>
```
```
    <alias>csh</alias>
```
```
    <filename>*.tcsh</filename>
```
```
    <filename>*.csh</filename>
```

    <mime_type>application/x-csh</mime_type>

```
  </config>
```
```
  <rules>
```
```
    <state name="basic">
```

      <rule pattern="\b(if|endif|else|while|then|foreach|case|default|continue|goto|breaksw|end|switch|endsw)\s*\b">

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

      <rule pattern="\b(alias|alloc|bg|bindkey|break|builtins|bye|caller|cd|chdir|complete|dirs|echo|echotc|eval|exec|exit|fg|filetest|getxvers|glob|getspath|hashstat|history|hup|inlib|jobs|kill|limit|log|login|logout|ls-F|migrate|newgrp|nice|nohup|notify|onintr|popd|printenv|pushd|rehash|repeat|rootnode|popd|pushd|set|shift|sched|setenv|setpath|settc|setty|setxvers|shift|source|stop|suspend|source|suspend|telltc|time|umask|unalias|uncomplete|unhash|universe|unlimit|unset|unsetenv|ver|wait|warp|watchlog|where|which)\s*\b">

```
        <token type="NameBuiltin"/>
```
```
      </rule>
```
```
      <rule pattern="#.*">
```
```
        <token type="Comment"/>
```
```
      </rule>
```
```
      <rule pattern="\\[\w\W]">
```

        <token type="LiteralStringEscape"/>

```
      </rule>
```
```
      <rule pattern="(\b\w+)(\s*)(=)">
```
```
        <bygroups>
```
```
          <token type="NameVariable"/>
```
```
          <token type="Text"/>
```
```
          <token type="Operator"/>
```
```
        </bygroups>
```
```
      </rule>
```
```
      <rule pattern="[\[\]{}()=]+">
```
```
        <token type="Operator"/>
```
```
      </rule>
```

      <rule pattern="&lt;&lt;\s*(\&#39;?)\\?(\w+)[\w\W]+?\2">

```
        <token type="LiteralString"/>
```
```
      </rule>
```
```
      <rule pattern=";">
```
```
        <token type="Punctuation"/>
```
```
      </rule>
```
```
    </state>
```
```
    <state name="data">
```

      <rule pattern="(?s)&#34;(\\\\|\\[0-7]+|\\.|[^&#34;\\])*&#34;">

        <token type="LiteralStringDouble"/>

```
      </rule>
```

      <rule pattern="(?s)&#39;(\\\\|\\[0-7]+|\\.|[^&#39;\\])*&#39;">

        <token type="LiteralStringSingle"/>

```
      </rule>
```
```
      <rule pattern="\s+">
```
```
        <token type="Text"/>
```
```
      </rule>
```

      <rule pattern="[^=\s\[\]{}()$&#34;\&#39;`\\;#]+">

```
        <token type="Text"/>
```
```
      </rule>
```
```
      <rule pattern="\d+(?= |\Z)">
```
```
        <token type="LiteralNumber"/>
```
```
      </rule>
```
```
      <rule pattern="\$#?(\w+|.)">
```
```
        <token type="NameVariable"/>
```
```
      </rule>
```
```
    </state>
```
```
    <state name="curly">
```
```
      <rule pattern="\}">
```
```
        <token type="Keyword"/>
```
```
        <pop depth="1"/>
```
```
      </rule>
```
```
      <rule pattern=":-">
```
```
        <token type="Keyword"/>
```
```
      </rule>
```
```
      <rule pattern="\w+">
```
```
        <token type="NameVariable"/>
```
```
      </rule>
```

      <rule pattern="[^}:&#34;\&#39;`$]+">

```
        <token type="Punctuation"/>
```
```
      </rule>
```
```
      <rule pattern=":">
```
```
        <token type="Punctuation"/>
```
```
      </rule>
```
```
      <rule>
```
```
        <include state="root"/>
```
```
      </rule>
```
```
    </state>
```
```
    <state name="paren">
```
```
      <rule pattern="\)">
```
```
        <token type="Keyword"/>
```
```
        <pop depth="1"/>
```
```
      </rule>
```
```
      <rule>
```
```
        <include state="root"/>
```
```
      </rule>
```
```
    </state>
```
```
    <state name="backticks">
```
```
      <rule pattern="`">
```

        <token type="LiteralStringBacktick"/>

```
        <pop depth="1"/>
```
```
      </rule>
```
```
      <rule>
```
```
        <include state="root"/>
```
```
      </rule>
```
```
    </state>
```
```
    <state name="root">
```
```
      <rule>
```
```
        <include state="basic"/>
```
```
      </rule>
```
```
      <rule pattern="\$\(">
```
```
        <token type="Keyword"/>
```
```
        <push state="paren"/>
```
```
      </rule>
```
```
      <rule pattern="\$\{#?">
```
```
        <token type="Keyword"/>
```
```
        <push state="curly"/>
```
```
      </rule>
```
```
      <rule pattern="`">
```

        <token type="LiteralStringBacktick"/>

```
        <push state="backticks"/>
```
```
      </rule>
```
```
      <rule>
```
```
        <include state="data"/>
```
```
      </rule>
```
```
    </state>
```
```
  </rules>
```
```
</lexer>
```