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A fragment entry is defined by an entry whose `fragment` field is `true`, and is referenced by a fragment expression (`\f{...}`).
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\p{property name=property value} matches a character has the property.
When the property name is General_Category, it can be omitted.
That is, \p{Letter} equals \p{General_Category=Letter}.
Currently, only General_Category is supported.
This feature meets RL1.2 of UTS #18 partially.
RL1.2 Properties: https://unicode.org/reports/tr18/#RL1.2
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\u{hex string} matches a character has the code point represented by the hex string.
For instance, \u{3042} matches hiragana あ (U+3042). The hex string must have 4 or 6 digits.
This feature meets RL1.1 of UTS #18.
RL1.1 Hex Notation: https://unicode.org/reports/tr18/#RL1.1
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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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