replace and nest in html tags

[Anon]

Hi,

I'm trying to get to grips with regular expressions and I'm trying to so the following:

I would like to replace:

• [x]this is first try.
  [x]this is second try.
  [xx]this is third try.

  • with this:

    <ul>
    <li>this is first try</li>
    <li>this is second try</li>
    <ul><li>this is third try</li></ul>
    </ul>

    can anybody give me a clue?,

    thanks
    mike