isxdigit

Return 1 if a character is a valid hexadecimal character.

Syntax: x = islower(char)

x 1 if char is A-Z, a-f, or 0-9
0 otherwise
char The character to test

Example:

Dim x as uByte
x=isxdigit("Z")   ' x=0
x=isxdigit("A")   ' x=1
x=isxdigit("f")   ' x=1
x=isxdigit("0")   ' x=1

Also See: