IsASCIILDH Function

Determines if a byte value is a Letter, Digit, or Hyphen in the US-ASCII character set.

Pascal

function IsASCIILDH(
    const AByte: Byte
): Boolean; overload;

Parameters

Parameters	Description
AByte	Value to check for Letter, Digit, or Hyphen compliance.

Returns

Boolean - True when the byte is a Letter, Digit, or Hyphen.

Description

IsASCIILDH is an overloaded Boolean function used to determine if the value in AByte represents a Letter, Digit, or Hyphen in the US-ASCII character set.

IsASCIILDH returns True when Abyte contains a byte value 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 bytes values in TIdBytes for Letter, Digit, and Hyphen compliance.