- reguexec() added.
- tre_have_backrefs() and tre_have_approx() added.
- New syntax: \Q, \E, \x1B, \x{263a}, (?inr-inr), (?inr-inr:regex).
- New compilation flag REG_RIGHT_ASSOC.
- New execution flags REG_APPROX_MATCHER and REG_BACKTRACKING_MATCHER.
- Included Python language bindings contributed by Nikolai SAOUKH.
- Several bugs and compilation problems fixed.