字符 Characters

The following terms are used to denote specific Unicode character classes:

下面的术语将用来表示特殊的Unicode字符类

newline        = /* the Unicode code point U+000A */ .
unicode_char   = /* an arbitrary Unicode code point except newline */ .
unicode_letter = /* a Unicode code point classified as "Letter" */ .
unicode_digit  = /* a Unicode code point classified as "Decimal Digit" */ .

In [The Unicode Standard 6.3](http://t.cn/zRz14zg), Section 4.5 "General Category" defines a set of character categories. Go treats those characters in category Lu, Ll, Lt, Lm, or Lo as Unicode letters, and those in category Nd as Unicode digits.

在Unicode标砖6.3,4.5章节 "General Category" 定义为一组字符集.Go将这个字符集里面的Unicode字符当作Unicode数字