forked from boostorg/regex
Re-ordered code in static_mutex.hpp to satisfy SGI IRIX. Added some additional #includes to satisfy SGI Irix. Fixed strange bug where some non-greedy repeats could repeat more times than permitted. Fixed return value from basic_regex<>::empty(). Fixed return value from basic_regex<>::expression() and basic_regex<>::size() when the expression is invalid. [SVN r30604]