[Boost-users] Boost RegEx for C++

Hello All. I'm using the C++ library of boost RegEx. Long story short: I'm trying the expression (?<=<h1>).*?(?=</h1>) On the string <h1>hello there</h1> and the engine crashes (asserts in Kernel32(d).dll) Is this a known issue? here's my code snippet. std::vectorstd::string v; boost::RegEx expr( "<h1>hello there</h1>", TRUE); expr.Grep(v, "(?<=<h1>).*?(?=</h1>)" ); thanks for any help! - Per