regexp searching in arrays not working?

Hi all,
have a column which is of type text[]. the following works:

select * from table where 'Transformer' = ANY (thiscol)

this also works

select * from table where 'Transformer' ~ ANY (thiscol)

however if i have a partial string like so

select * from table where 'Trans' ~ ANY (thiscol)

it returns nothing.

Is regex searching not functioning (as i expect it to?) i searched the docs
and didnt see anything about it.

Regards

Rhys