updated to version 2.0.3
see installed CHANGELOG.md
## [2.0.3] - 2020-12-28 - [Janosch Müller](mailto:janosch84@gmail.com)

### Fixed

- fixed error when scanning some unlikely and redundant but valid charset patterns
- e.g. `/[[.a-b.]]/`, `/[[=e=]]/`,
- fixed ancestry of some error classes related to syntax version lookup
- `NotImplementedError`, `InvalidVersionNameError`, `UnknownSyntaxNameError`
- they now correctly inherit from `Regexp::Syntax::SyntaxError` instead of Rubys `::SyntaxError`

## [2.0.2] - 2020-12-25 - [Janosch Müller](mailto:janosch84@gmail.com)

### Fixed

- fixed `FrozenError` when calling `#to_s` on a frozen `Group::Passive`
* thanks to [Daniel Gollahon](https://github.com/dgollahon)

## [2.0.1] - 2020-12-20 - [Janosch Müller](mailto:janosch84@gmail.com)

### Fixed

- fixed error when scanning some group names
* this affected names containing hyphens, digits or multibyte chars, e.g. `/(?a)/`
* thanks to [Daniel Gollahon](https://github.com/dgollahon) for the report
- fixed error when scanning hex escapes with just one hex digit
* e.g. `/\x0A/` was scanned correctly, but the equivalent `/\xA/` was not
* thanks to [Daniel Gollahon](https://github.com/dgollahon) for the report

## [2.0.0] - 2020-11-25 - [Janosch Müller](mailto:janosch84@gmail.com)

### Changed

- some methods that used to return byte-based indices now return char-based indices
* the returned values have only changed for Regexps that contain multibyte chars
* this is only a breaking change if you used such methods directly AND relied on them pointing to bytes
* affected methods:
* `Regexp::Token` `#length`, `#offset`, `#te`, `#ts`
* `Regexp::Expression::Base` `#full_length`, `#offset`, `#starts_at`, `#te`, `#ts`
* thanks to [Akinori MUSHA](https://github.com/knu) for the report
- removed some deprecated methods/signatures
* these are rarely used and have been showing deprecation warnings for a long time
* `Regexp::Expression::Subexpression.new` with 3 arguments
* `Regexp::Expression::Root.new` without a token argument
* `Regexp::Expression.parsed`

### Added

- `Regexp::Expression::Base#base_length`
* returns the character count of an expression body, ignoring any quantifier
- pragmatic, experimental support for chained quantifiers
* e.g.: `/^a{10}{4,6}$/` matches exactly 40, 50 or 60 `a`s
* successive quantifiers used to be silently dropped by the parser
* they are now wrapped with passive groups as if they were written `(?:a{10}){4,6}`
* thanks to [calfeld](https://github.com/calfeld) for reporting this a while back

### Fixed

- incorrect encoding output for non-ascii comments
* this led to a crash when calling `#to_s` on parse results containing such comments
* thanks to [Michael Glass](https://github.com/michaelglass) for the report
- some crashes when scanning contrived patterns such as `'\😋'`