• Use the migration guide when updating.
• Changed enumerators to lowercase.
  • Renamed tracking_mode::IMMEDIATE to tracking_mode::eager.
  • Compatibility enumerators with uppercase names are still included.
    • Will be removed in version 3.0.0.
• Renamed peek_byte() to peek_uint8().
  • Compatibility member functions with previous names are still included.
    • Will be removed in version 3.0.0.
• Allowed actions to implement match.
• Made deriving action class templates from nothing optional.
• Added debug tools require_apply and require_apply0.
• Added combinator class rematch.
• Improved the Parse Tree / AST interface to mostly hide its internal state.
• Added new action-based helpers change_*.hpp.
  • The control-based helpers in contrib/changes.hpp are still included.
    • Will be removed in version 3.0.0.
• Added new action-based helpers disable_action.hpp and enable_action.hpp.
• Added new action-based helpers discard_input.hpp, discard_input_on_success.hpp, and discard_input_on_failure.hpp.
• Added Clang Static Analyzer to the CI build.
• Added new Makefile target amalgamate to generate a single-header version of the PEGTL.
• Added support for Universal Windows Platform (UWP).