I fixed the problem.

For debug: my project setting as:
C/C++ > Code Generation > Runtime LIbrary as "Multi-threaded DLL (/MD)"

But in my release setting:
C/C++ > Code Generation > Runtime LIbrary as "Multi-threaded (/MT)"

When I changed it to "Multi-threaded DLL (/MD)", then it works!

As indicated in the boost/boost/config/user.hpp, which needs _DLL flag.

Thanks,
Maggie

---------- Forwarded message ----------
From: maggie.nguyen@gmail.com <maggie.nguyen@gmail.com>
Date: Sep 29, 2006 9:45 AM
Subject: boost regex library problem with release build
To:

Hi,

I use Visual Studios 2005.

In my project file, I include the library in linker:
"Additional Library Directories: ..\..\boost\lib"

I have these libs in the boost\lib directory:

libboost_date_time-vc80-mt-1_33_1.lib
libboost_date_time-vc80-mt-gd-1_33_1.lib
libboost_regex-vc80-mt-1_33_1.lib
libboost_regex-vc80-mt-gd-1_33_1.lib
libboost_thread-vc80-mt-1_33_1.lib
libboost_thread-vc80-mt-gd-1_33_1.lib

When I build my project as a debug build. it compiles fine.

However, if I change to release build, it gives me this error:

Error 1 fatal error LNK1104: cannot open file
'libboost_regex-vc80-mt-s-1_33_1.lib'

Please let me know what I need to do to have it point to
"libboost_regex-vc80-mt-1_33_1.lib" instead of
"libboost_regex-vc80-mt-s-1_33_1.lib".

Thanks very much,
Maggie