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---
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editLink: false
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---
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> See [commit history](https://github.com/pegjs/pegjs/compare/0.3...0.4) for a full list of changes.
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## v0.4 _(April 17, 2010)_
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### Big Changes
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* Improved IE compatibility — IE6+ is now fully supported.
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* Generated parsers are now standalone (no runtime is required).
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* Added example grammars for JavaScript, CSS and JSON.
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* Added a benchmark suite.
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* Implemented negative character classes (e.g. `[^a-z]`).
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* Project moved from BitBucket to GitHub.
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### Small Changes
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* Code generated for the character classes is now regexp-based (= simpler and more scalable).
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* Added `\uFEFF` (BOM) to the definition of whitespace in the metagrammar.
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* When building a parser, left-recursive rules (both direct and indirect) are reported as errors.
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* When building a parser, missing rules are reported as errors.
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* Expected items in the error messages do not contain duplicates and they are sorted.
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* Fixed several bugs in the example arithmetic's grammar.
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* Converted `README` to GitHub Flavored Markdown and improved it.
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* Added `CHANGELOG`.
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* Internal code improvements.
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