grep obsolete, why?

[Dinu C. Gherman]

I have difficulties to find any documentation for the
grep standard library module. After a web research I
found that it seems to be considered obsolete. 

Is there any background information available for this 
estimation as well as on what should replace grep?

Thanks,

Dinu 

-- 
Dinu C. Gherman
................................................................
"The only possible values [for quality] are 'excellent' and 'in-
sanely excellent', depending on whether lives are at stake or 
not. Otherwise you don't enjoy your work, you don't work well, 
and the project goes down the drain." 
                    (Kent Beck, "Extreme Programming Explained")