Grep in Python

[coolslife]

hi, 
 
  I tried looking for a "Grep" type utility module in jython/python.
But I did not find any. Is there one available that can be used?
 
I saw that lots of people have implemented their own version of grep
and most have called it "pygrep". (Am I right about that?). Since this
is a resource consuming activity,  does anyone have any idea what
might be a optimum way to implement this?
 
thanx,
Chhaya.