7.4.83. XRANGE (Hexadecimal Range)

Returns a string of all valid 1-byte encodings (in ascending order) between and including the values start and end, or a character sequence representing a POSIX character class name. Any number of start / end bytes and character class names can be specified, and all resulting sequences are returned as a concatenated string.

The default value for start is '00'x, and the default value for end is 'ff'x. If start is greater than end, the values wrap from 'ff'x to '00'x. If specified, start and end must be single characters.

The characters in a sequence representing a POSIX character class name are returned in ascending order. The following POSIX character class names can be specified:

Name	Description	Returned sequence
`ALNUM`	Alphanumeric characters	`0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ abcdefghijklmnopqrstuvwxyz`
`ALPHA`	Alphabetic characters	`ABCDEFGHIJKLMNOPQRSTUVWXYZ abcdefghijklmnopqrstuvwxyz`
`BLANK`	Space and tab	`'09 20'x`
`CNTRL`	Control characters	`'00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10 11 12 13 14 15 16 17 18 19 1A 1B 1C 1D 1E 1F 7F'x`
`DIGIT`	Digits	`0123456789`
`GRAPH`	Visible characters	!"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_` abcdefghijklmnopqrstuvwxyz{\|}~
`LOWER`	Lowercase letters	`abcdefghijklmnopqrstuvwxyz`
`PRINT`	Visible characters and space character	!"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_` abcdefghijklmnopqrstuvwxyz{\|}~
`PUNCT`	Punctuation characters	!"#$%&'()*+,-./:;<=>?@[\]^_`{\|}~
`SPACE`	Whitespace characters	`'09 0A 0B 0C 0D 20'x`
`UPPER`	Uppercase letters	`ABCDEFGHIJKLMNOPQRSTUVWXYZ`
`XDIGIT`	Hexadecimal digits	`0123456789ABCDEFabcdef`

Here are some examples:

Example 7.112. Builtin function XRANGE

XRANGE("a", "f")                     --> "abcdef"
XRANGE('03'x, '07'x)                 --> '0304050607'x
XRANGE(, '04'x)                      --> '0001020304'x
XRANGE('FE'x, '02'x)                 --> 'FEFF000102'x
XRANGE("t", "t", "h", "i", "r", "t") --> "thirst"
XRANGE('xdigit')                     --> "0123456789ABCDEFabcdef"
XRANGE("a", "f", "A", "F", "digit")  --> "abcdefABCDEF0123456789"