namespace problems

[nobody]

when , I include the file regex.hpp, then i can't use the 
standard c library unless I go std::strcat ect...

My question is , how does boost make this happen, 
since i change all my calls to the stanard C library to 
include std::, and I don't need boost any more. 

 Simply included boost is not a wise solution, I wonder is 
there a way to do this on my own without boost or 
regex.hpp to be exact.

my email address is vbmew@hotmail.com

-thank you

[Vladimir Prus]

Logged In: YES 
user_id=321498

I'm afraid, this question has nothing to do with boost, in a general 
namespace question. I suggest asking in some C++ newsgroup (e.g. 
comp.lang.c++).  
 
Hint: 
    #include <stdlib.h> 
allows you to call C functions without std::, while 
   #include <cstdlib> 
does not.