The IsBinaryDigit(char) command determines whether char is a binary digit. A character is a binary digit if it is one of "0" or "1".

If char is a binary digit, IsBinaryDigit returns true. Otherwise, false is returned.

The IsHexDigit(char) command determines whether char is a hexadecimal digit. A character is a hexadecimal digit if it is  one of the characters

If char is a hexadecimal digit, IsHexDigit returns true. Otherwise, false is returned.

The IsOctalDigit(char) command determines whether char is an octal digit. A character is an octal digit if it is one of the characters

If char is an octal digit, IsOctalDigit returns true. Otherwise, false is returned.

For each of these functions, if char is a string that contains more than one character, then all the characters in the string are tested.

Note: These commands return the value true whenever the condition tested for is true of all characters in the input string. For the empty string, the tested condition is vacuously true for all characters in the string.

All of the StringTools package commands treat strings as (null-terminated) sequences of $8$-bit (ASCII) characters.  Thus, there is no support for multibyte character encodings, such as unicode encodings.

The StringTools[IsBinaryDigit], StringTools[IsHexDigit] and StringTools[IsOctalDigit] commands are thread-safe as of Maple 15.

For more information on thread safety, see index/threadsafe.

$\mathrm{with}\left(\mathrm{StringTools}\right)\:$

$s≔\mathrm{convert}\left(\left[\mathrm{`\$`}\left(1..255\right)\right]\,'\mathrm{bytes}'\right)\:$

$\mathrm{length}\left(s\right)$

$255$

$\mathrm{Select}\left(\mathrm{IsHexDigit}\,s\right)$

$''0123456789ABCDEFabcdef''$

$\mathrm{Select}\left(\mathrm{IsBinaryDigit}\,s\right)$

$''01''$

$\mathrm{Select}\left(\mathrm{IsOctalDigit}\,s\right)$

$''01234567''$