Retrieve 7 digits number

Hi,

Assume the following string in a single cell:

ABC 1235674 DE 12 FGH 34567 1235674 IJKL 987654321 1235674 MN

I need to retrieve the 7 digits number which can occur more than once, may be anywhere within the string BUT will always be identical.
(Other numbers may vary and there may be more than one space between the items and there is no constant pattern)

If it is for any help I can retrieve and return the following strings with some add-in:

;1235674;12;34567;1235674;987654321;1235674;
1235674 12 34567 1235674 987654321 1235674

or with any other delimiter.

What will be the fastest and shortest way to return the 7 digits number ?
(If use of the add-in can be eliminated it will be just fine)

Thanks, Elm