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

```
<lexer>
```
```
  <config>
```
```
    <name>Awk</name>
```
```
    <alias>awk</alias>
```
```
    <alias>gawk</alias>
```
```
    <alias>mawk</alias>
```
```
    <alias>nawk</alias>
```
```
    <filename>*.awk</filename>
```

    <mime_type>application/x-awk</mime_type>

```
  </config>
```
```
  <rules>
```
```
    <state name="root">
```
```
      <rule pattern="^(?=\s|/)">
```
```
        <token type="Text"/>
```

        <push state="slashstartsregex"/>

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

        <include state="commentsandwhitespace"/>

```
      </rule>
```

      <rule pattern="\+\+|--|\|\||&amp;&amp;|in\b|\$|!?~|\|&amp;|(\*\*|[-&lt;&gt;+*%\^/!=|])=?">

```
        <token type="Operator"/>
```

        <push state="slashstartsregex"/>

```
      </rule>
```
```
      <rule pattern="[{(\[;,]">
```
```
        <token type="Punctuation"/>
```

        <push state="slashstartsregex"/>

```
      </rule>
```
```
      <rule pattern="[})\].]">
```
```
        <token type="Punctuation"/>
```
```
      </rule>
```

      <rule pattern="(break|continue|do|while|exit|for|if|else|return|switch|case|default)\b">

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

        <push state="slashstartsregex"/>

```
      </rule>
```
```
      <rule pattern="function\b">
```

        <token type="KeywordDeclaration"/>

        <push state="slashstartsregex"/>

```
      </rule>
```

      <rule pattern="(atan2|cos|exp|int|log|rand|sin|sqrt|srand|gensub|gsub|index|length|match|split|patsplit|sprintf|sub|substr|tolower|toupper|close|fflush|getline|next(file)|print|printf|strftime|systime|mktime|delete|system|strtonum|and|compl|lshift|or|rshift|asorti?|isarray|bindtextdomain|dcn?gettext|@(include|load|namespace))\b">

        <token type="KeywordReserved"/>

```
      </rule>
```

      <rule pattern="(ARGC|ARGIND|ARGV|BEGIN(FILE)?|BINMODE|CONVFMT|ENVIRON|END(FILE)?|ERRNO|FIELDWIDTHS|FILENAME|FNR|FPAT|FS|IGNORECASE|LINT|NF|NR|OFMT|OFS|ORS|PROCINFO|RLENGTH|RS|RSTART|RT|SUBSEP|TEXTDOMAIN)\b">

```
        <token type="NameBuiltin"/>
```
```
      </rule>
```
```
      <rule pattern="[@$a-zA-Z_]\w*">
```
```
        <token type="NameOther"/>
```
```
      </rule>
```

      <rule pattern="[0-9][0-9]*\.[0-9]+([eE][0-9]+)?[fd]?">

        <token type="LiteralNumberFloat"/>

```
      </rule>
```
```
      <rule pattern="0x[0-9a-fA-F]+">
```

        <token type="LiteralNumberHex"/>

```
      </rule>
```
```
      <rule pattern="[0-9]+">
```

        <token type="LiteralNumberInteger"/>

```
      </rule>
```

      <rule pattern="&#34;(\\\\|\\&#34;|[^&#34;])*&#34;">

        <token type="LiteralStringDouble"/>

```
      </rule>
```

      <rule pattern="&#39;(\\\\|\\&#39;|[^&#39;])*&#39;">

        <token type="LiteralStringSingle"/>

```
      </rule>
```
```
    </state>
```

    <state name="commentsandwhitespace">

```
      <rule pattern="\s+">
```
```
        <token type="Text"/>
```
```
      </rule>
```
```
      <rule pattern="#.*$">
```
```
        <token type="CommentSingle"/>
```
```
      </rule>
```
```
    </state>
```
```
    <state name="slashstartsregex">
```
```
      <rule>
```

        <include state="commentsandwhitespace"/>

```
      </rule>
```

      <rule pattern="/(\\.|[^[/\\\n]|\[(\\.|[^\]\\\n])*])+/\B">

        <token type="LiteralStringRegex"/>

```
        <pop depth="1"/>
```
```
      </rule>
```
```
      <rule pattern="(?=/)">
```
```
        <token type="Text"/>
```

        <push state="#pop" state="badregex"/>

```
      </rule>
```
```
      <rule>
```
```
        <pop depth="1"/>
```
```
      </rule>
```
```
    </state>
```
```
    <state name="badregex">
```
```
      <rule pattern="\n">
```
```
        <token type="Text"/>
```
```
        <pop depth="1"/>
```
```
      </rule>
```
```
    </state>
```
```
  </rules>
```
```
</lexer>
```