Is hex

IS_HEX

Type Function	BOOL
Input STR	STRING (String input)
Output	BOOL (TRUE if STR contains only hexadecimal)
	IS_HEX tests whether the string STR contains only hexadecimal characters are. If another character is found the function returns FALSE. If in STR are only hexadecimal characters included, the function returns TRUE. The hexadecimal character are characters with the decimal code 0..9, a..f. and A..F.