Extract values from the String filed in SQL server

@Naomi, Sorry the issue is not due to below sample data:

Number of Sales: <Area="XBA" Number="">0</a><XX>END

The issue is because of the this kind of data in the same field.

No Sales were happened: SPANISH<UV>END

Here is the DDL and sample data:

declare @t table (ID int identity(1,1) primary key, htmlString nvarchar(max))
insert into @t (htmlString) 

values ('Number of Sales: <Area="ABC" Number="1012,1013,1014,1015">4</a><ZZ>END'),
('Number of Sales: <Area="CBA" Number="1011,1012,1013,1014,1015,1016,1017,1018,1019,1020">10</a><YY>END'),
('Number of Sales: <Area="XBA" Number="">0</a><XX>END'),
('No Sales were happened: SPANISH<UV>END')

;with cte as (
select *, 
substring(htmlString, patindex('% Number="%">%', htmlString) +  len(' Number="'), len(htmlString)) as OrderNumbers,
substring(htmlString, patindex('%">%', htmlString) +  2, len(htmlString)) as NumberStart
from @t)

select *, 
substring(OrderNumbers, 1, PATINDEX('%">%', OrderNumbers)-1) as OrderNumbers,
substring(NumberStart, 1, PATINDEX('%</a>%', NumberStart)-1) as Number
from cte

IDOrder NumbersValues
11012,1013,1014,10154
21011,1012,1013,1014,1015,1016,1017,1018,1019,102010
3NULL                                                                               0
4          N/A                                                                                  N/A

Thanks for your help on this.