I'm not sure what you're expecting to gain from using regular expressions in this case unless you are looking for whole words not just partial matches. Anyway, regular expression do not support such kind of search in one expression.
You may want to check Thread #1410639 Fastest way to check memo field for a string

>given that activity is a c(100) field in a table
>
>what is the best way to find records where several words are present but not necessarily together
>
>eg:
>
>mouse+trap+living room
>i want to find all occurrences where 'mouse' is existing as well 'trap' and 'living room'
>at the moment i have something like
>'mouse'$activity and 'trap'$ activity and 'living room'$activity
>
>which is kind of cumbersome once there are more than 3 phrases
>I hope there is a way to do that with regex???
>
>