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##### Character Generators

See here for more information about Character Generators.

Expression | Attribute | Description
--- | --- | ---
`ch` | `Unused` | Generate `ch`
`lit(ch)` | `Unused` | Generate `ch`
`char_` | `Ch` | Generate character supplied as the attribute
`char_(ch)` | `Ch` | Generate `ch`, if an attribute is supplied it must match
`char_("c")` | `Ch` | Generate a single char string literal, `c`, if an attribute is supplied it must match
`char_(ch, ch2)` | `Ch` | Generate the character supplied as the attribute, if it belongs to the character range from `ch` to `ch2`
`char_(charset)` | `Ch` | Generate the character supplied as the attribute, if it belongs to the character set `charset`
`alnum` | `Ch` | Generate the character supplied as the attribute if it satisfies the concept of `std::isalnum` in the character set defined by `NS`
`alpha` | `Ch` | Generate the character supplied as the attribute if it satisfies the concept of `std::isalpha` in the character set defined by `NS`
`blank` | `Ch` | Generate the character supplied as the attribute if it satisfies the concept of `std::isblank` in the character set defined by `NS`
`cntrl` | `Ch` | Generate the character supplied as the attribute if it satisfies the concept of `std::iscntrl` in the character set defined by `NS`
`digit` | `Ch` | Generate the character supplied as the attribute if it satisfies the concept of `std::isdigit` in the character set defined by `NS`
`graph` | `Ch` | Generate the character supplied as the attribute if it satisfies the concept of `std::isgraph` in the character set defined by `NS`
`print` | `Ch` | Generate the character supplied as the attribute if it satisfies the concept of `std::isprint` in the character set defined by `NS`
`punct` | `Ch` | Generate the character supplied as the attribute if it satisfies the concept of `std::ispunct` in the character set defined by `NS`
`space` | `Ch` | Generate the character supplied as the attribute if it satisfies the concept of `std::isspace`, or a single space character in the character set defined by `NS`
`xdigit` | `Ch` | Generate the character supplied as the attribute if it satisfies the concept of `std::isxdigit` in the character set defined by `NS`
`lower` | `Ch` | Generate the character supplied as the attribute if it satisfies the concept of `std::islower` in the character set defined by `NS`
`upper` | `Ch` | Generate the character supplied as the attribute if it satisfies the concept of `std::isupper` in the character set defined by `NS`