RegexExpression describes the RegexRule body, and is also used in some places where a regular expression should be specified.
The result of the RegexExpression parsing is the NSpan type that describes a text span. AST nodes are not created for RegexExpression.
See also
RegexRule
Choice
Sequence
Optional
ZeroOrMany
OneOrMany
Invert
Subtract
Char
String
Call
Rounds
Range
InvertedRange
ZeroOrManyWithSeparator
OneOrManyWithSeparator
NSpan