robots.txt with wildcard?

[tranceformer]

Googlebot is eating up about 30GB bandwidth per month.
I want to prevent him (and other robots) from spidering:

[mysite.com...]

and all derivatives thereof (e.g. [mysite.com...]

Is this possible with robots.txt? How would the code look?

Will this work?
User-agent: *
Disallow: /directory1/page1.php

or do I need to somehow specify a wildcard, e.g.
User-agent: *
Disallow: /directory1/page1.php?*
Thanks for your help!

[coopster]

Are you certain you want to Prevent content from appearing in Google search results [google.com]?

[g1smd]

The partial URL in robots.txt is matched "from the left" so there is no point whatsoever in having wildcards at the extreme right of the disallow statement.