Primitive Lexer Components

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#### Primitive Lexer Components

Expression | Attribute | Description
--- | --- | ---
`ch` | n/a | Matches `ch`
`char_(ch)` | n/a | Matches `ch`
`str` | n/a | Matches regular expression `str`
`string(str)` | n/a | Matches regular expression `str`
`token_def<Attrib>` | `Attrib` | Matches the immediate argument
`a | b` | n/a | Matches any of the expressions `a` or `b`
`l[fa]` | Attribute of `l` | Call semantic action `fa` (after matching `l`).

| Note
The column Attribute in the table above lists the parser attribute exposed by the lexer component if it is used as a parser (see Attribute). A 'n/a' in this columns means the lexer component is not usable as a parser.