I'm getting this runtime error in my program.

c:\stlport-4.6.2\stlport\stl\debug\_iterator.h(179): STL assertion failure : __check_same_owner(__x, __y)

The code that causes this is like this (Actual code slightly modified). It is the access of the match that triggers the error above.

boost::smatch m; if (regex_match(s, m, reg)) { (here)--> s_info.version = m[1]; }

I'm using stlport 4.6.2 with boost-1.32 on W2K and VC6 SP6. stlport is built with default options and boost is built like this:

I regularly test with that compiler/std lib combination so it shouldn't be an issue.

Any idea what can be wrong? Surely a simple access of the resulting match shouldn't cause this type of assertion to fire (or is there some subtle bug in my program that I'm missing!?)

I suspect that you are creating a std::string from the sub_match? If so then STLport will validate the iterator range during the strings constructor, so a failure there is theoretically possible, but of course should never really happen. I don't really know what to suggest, can you post a test case? One thing to double check before you do: make sure that the iterators held by the match_results structure haven't been invalidated by your code: destroying the string to which they refer, or passing a temporary to regex_match would cause it. John.