Beginner, very simple hook question

[doahh]

Hello,

When I do a commit I would like to check that the file being committed
contains a particular piece of text if it is in a particular directory (such
as web or src). I have been reading:

http://hgbook.red-bean.com/hgbookch10.html
http://www.selenic.com/mercurial/wiki/index.cgi/Hook?highlight=(hook)

and the best I have come up with is:

pretxncommit.file.changed.notice = hg export tip | grep "This file has been
modified"

However this doesn't work reliably, I think because I am looking at the tip
and not the currently being committed file. Every now and again it will let
the file through without the text. In SVN I was using svn look to get the
information about the file being committed (both it's path so I can check
the directory and its contents so I can check for the text), is their an
equivalent in mercurial? 
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