Regular expression question

[hessodreamy]

Haven't quite got to grips with regular expressions yet, so could someone help me with this query:

I need to select a field from a table, but excluding any text that is enclosed within brackets.
For example, we have this data:

'(1) row 1'
'row 2'
'(3)row 3 (yes, that's 3)'

I need to return:
'row 1'
'row 2'
'row 3'

Thanks muchly