regular expressions in query

My database table holds phone numbers that may contain characters other
than digits (that's not a problem in itself).

I want to be able to apply a regular expression (to ignore all
characters except digits) to the attribute 'phone' first and then for
the ILIKE to compare
the result to $telephone. I can't find any way of applying the RE to phone.
My current query without the RE is as follows:

SELECT telephone FROM addresses WHERE id = user_id AND phone ILIKE
'%".addslashes($telephone)."%'"
I want to do something like: AND phone([^[:digit:]]) ILIKE $telephone
But this doesn't work.
Any ideas?
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