charclass

type CharClass struct {
	// Map represents individual elements
	Map map[rune]bool
	// RangeTable represents ranges
	*unicode.RangeTable
	// Negated indicates that the char class expression is negated.
	Negated bool
	// Special is empty or otherwise indicates a special class, with expectation that
	// method unicode.${Special} exists. The regex notation taken from GNU Grep
	// is translated into unicode package name conventions (e.g. "[:alpha:]" -> "IsLetter").
	// "[:alnum:]" is a special special case and is represented by the value "[:alnum:]" without translation.
	Special string
}