How to allow for HTML character references?

Hi everyone

In PHP, I am using an ereg_replace to strip all but certain
allowed
characters
from a string:
$string = ereg_replace("([^
0-9A-Za-zŠŒŽšOEžŸÀ-ÖØ-öø-þ-])","",
$string);

I would like to extend this to allow HTML character
references of the
form "&#number;" where number is the three,
four or five digit code
number
of the character.   Examples would be
"ä", "ẽ" and
"茸".

How could I change the expression above to do this?

I am sorry but regular expressions hurt my brain!

Thankyou in advance
Karin


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