</pre>

<p>
In <a href="https://www.unicode.org/versions/Unicode8.0.0/">The Unicode Standard 8.0</a>,
Section 4.5 "General Category" defines a set of character categories.
Go treats all characters in any of the Letter categories Lu, Ll, Lt, Lm, or Lo
as Unicode letters, and those in the Number category Nd as Unicode digits.
</p>

<h3 id="Letters_and_digits">Letters and digits</h3>

<p>

<p>
The following terms are used to denote specific Unicode character categories:
</p>
<pre class="ebnf">
newline        = /* the Unicode code point U+000A */ .
unicode_char   = /* an arbitrary Unicode code point except newline */ .
unicode_letter = /* a Unicode code point categorized as "Letter" */ .
unicode_digit  = /* a Unicode code point categorized as "Number, decimal digit" */ .
</pre>

<p>

pkg unicode, var Buhid *RangeTable
pkg unicode, var C *RangeTable
pkg unicode, var Canadian_Aboriginal *RangeTable
pkg unicode, var Carian *RangeTable
pkg unicode, var CaseRanges []CaseRange
pkg unicode, var Categories map[string]*RangeTable
pkg unicode, var Cc *RangeTable
pkg unicode, var Cf *RangeTable
pkg unicode, var Cham *RangeTable
pkg unicode, var Cherokee *RangeTable
pkg unicode, var Co *RangeTable