diff -Naur boost_1_50_0_beta1/libs/regex/src/regex_raw_buffer.cpp boost_1_50_0_beta1_regexpatch/libs/regex/src/regex_raw_buffer.cpp
--- boost_1_50_0_beta1/libs/regex/src/regex_raw_buffer.cpp	2005-01-21 22:58:42.000000000 +0530
+++ boost_1_50_0_beta1_regexpatch/libs/regex/src/regex_raw_buffer.cpp	2012-06-27 12:22:26.000000000 +0530
@@ -45,6 +45,7 @@
    // allocate and copy data:
    register pointer ptr = static_cast<pointer>(::operator new(newsize));
    BOOST_REGEX_NOEH_ASSERT(ptr)
+   BOOST_REGEX_NOEH_ASSERT(start || !datasize)
    std::memcpy(ptr, start, datasize);
 
    // get rid of old buffer: