IsASCIILDH Function

Determines if a byte values contain only Letters, Digits, or Hyphens in the US-ASCII character set.

Pascal

function IsASCIILDH(
    const ABytes: TIdBytes
): Boolean; overload;

Parameters

Parameters	Description
ABytes	Values to check for Letter, Digit, or Hyphen compliance.

Returns

Boolean - True when the byte values contain only Letters, Digits, or Hyphens.

Description

IsASCIILDH is an overloaded Boolean function used to determine if the byte values in ABytes contains only Letters, Digits, or Hyphens characters from the US-ASCII character set.

IsASCIILDH returns True when all values in Abytes can be represented using characters in the following ranges:

Hex	Decimal	Characters
$2D	45	'-'
$30 .. $39	48 .. 57	'0' .. '9'
$41 .. $5A	59 .. 90	'A' .. 'Z'
$61 .. $7A	97 .. 122	'a' .. 'z'

Use the overloaded IsASCIILDH function to examine a single byte value for Letter, Digit, and Hyphen compliance.