Your app is being compiled in release mode, but you’re linking against the debug version of PCRE, which had /MTd (or similar) set, thus causing the mismatch in iterator debugging level in the CRT.
Recompile PCRE in release mode to match your own application.
The detect_mismatch pragma in VS 2010 is what causes this error to be emitted.
See http://blogs.msdn.com/b/vcblog/archive/2009/06/23/stl-performance.aspx (search for _ITERATOR_DEBUG_LEVEL)