I have a table with memo field where a datetime can be entered at various points in the field

How can i extract this datetime?

example for {04/09/2009 11:18:26 AM}

some text entered with date time field 04/09/2009 11:18:26 AM and then some more text

and i need to extract the "04/09/2009 11:18:26 AM" or what ever datetime is present
thanks in advance