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* Make the lexer treat ']' as an ordinary character in default mode
* Define values of the syntax error type that represents error information concretely
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* Add cases test the parse method.
* Fix the parser to pass the cases.
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[^a-z] matches any character that is not in the range a-z.
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[a-z] matches any one character from a to z. The order of the characters depends on Unicode code points.
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* a+ matches 'a' one or more times. This is equivalent to aa*.
* a? matches 'a' zero or one time.
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The bracket expression matches any single character specified in it. In the bracket expression, the special characters like ., *, and so on are also handled as normal characters.
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The dot symbol matches any single character. When the dot symbol appears, the parser generates an AST matching all of the well-formed UTF-8 byte sequences.
Refelences:
* https://www.unicode.org/versions/Unicode13.0.0/ch03.pdf#G7404
* Table 3-6. UTF-8 Bit Distribution
* Table 3-7. Well-Formed UTF-8 Byte Sequences
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The compiler takes a lexical specification expressed by regular expressions and generates a DFA accepting the tokens.
Operators that you can use in the regular expressions are concatenation, alternation, repeat, and grouping.
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