Will,
 
As Larry pointed out, '1N0N'  will allow 1 or more integers to  pass, while 
the test for >= 1 and <= MAX.VAL limits the range. If MAX.VAL  is 9 now, and is 
changed later to 10 or more, the same code will work.
 
Regards,
Charlie
 
[EMAIL PROTECTED] (mailto:[EMAIL PROTECTED])  writes:

Why  '1N0N' and not just '1N' ?
Will

In a message dated 2/13/2005 1:16:49  AM Pacific Standard Time, 
[EMAIL PROTECTED] writes:

> CASE SEL  MATCHES '1N0N' AND SEL >= 1 AND SEL <= MAX.VAL
> 
> This  forces each character of SEL to be an integer (0-9) and nothing   
else.
> 
> Regards,
> Charlie Noah
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