v0.16.2

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Added

• Add an "oniguruma mode" flag to control whether \< and \> are treated as literals or word-boundary assertions. (#​186)
• Add support for const-size backrefs in lookbehinds. (#​182)

Changed

• A few small internal changes which allowed us to expose a web-based playground for fancy-regex. (#​181)

Fixed

• Fix behavior of repetition on an empty match. (#​179)
• Always return the original input pattern when as_str is called. (#​185)
• Fix panic when matching non-ascii text as part of a case insensitive backref. (#​189)
• The toy example wasn't always showing the correct analysis or compiled program when optimizations were applied. (#​181)

v0.16.1

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Fixed

• Fixed a bug whereby sometimes a backreference to a non-existing capture group would compile successfully
  when it should fail, causing a panic in the VM when trying to match the regex. (#​174)

v0.16.0

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Added

• Add an optimization step after the pattern is parsed but before it is analyzed.
  Currently it only optimizes one specific use-case - where the expression is easy except
  for a trailing positive lookahead whose contents are also easy. The optimization is to delegate to the regex crate instead of using the backtracking VM. (#​171)

Changed

• Patterns which are anchored to the start of the text (i.e. with ^ when not in multiline mode) should now fail faster when there is no match, because fancy-regex no longer tries to match at other positions. (#​170)
• The CompileError for an invalid (numbered) backref has been updated to mention which backref was invalid (#​170)
• Removed dependency on derivative (#​169)

Fixed

• Fixed a bug whereby sometimes a capture group containing a backref to itself would cause a compile error, when it is valid - this fixes a few Oniguruma test cases (#​170)

v0.15.0

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Added

• Support \Z - anchor to the end of the text before any trailing newlines. (#​148)
• Support \O - any character including newlines. (#​158)
• The parser can now parse subroutine calls and relative backreferences (but execution is still unsupported). This is preparation for future work. Some new error variants have been added for features which can be parsed but are still otherwise unsupported.
• Backreferences can now be case insensitive. (#​160)
• RegexBuilder: Add options for multi_line, ignore_whitespace, dot_matches_new_line (#​165)

Fixed

• Fix infinite loop when backtracking limit is hit (#​153)
• Fix RegexBuilder.case_insensitive not always applying when it should. (#​163)
• The toy example has had various bugfixes, and unit tests added. (#​152, #​159)