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        "description": "# cffi_re2\n[![Build Status](https://travis-ci.org/vls/cffi_re2.png)](https://travis-ci.org/vls/cffi_re2)\n\ncffi_re2 is a cffi-based high-level Python binding for Google's [re2](https://github.com/google/re2) library.\n\n### Installation\n\nBefore installing cffi_re2, you will need to install re2. On Ubuntu/Debian you can do that using\n\n```bash\nsudo apt-get install libre2-dev\n```\n\nElse, you can simply install the current version from the git repository:\n\n```bash\ngit clone https://github.com/google/re2.git\nmake\nmake test\nsudo make install\n```\n\nSee the [re2 repository](https://github.com/google/re2) for further information.\n\nAfter installing re2, you can install cffi_re2:\n\n```bash\npip install cffi_re2\n```\nor from a local copy:\n```bash\nsudo python setup.py install\n```\n\n*cffi_re2* is fully compatbile with both *Python3.x* as well as [*PyPy*](pypy.org) (including *PyPy3*). \n\nYou can run the unit tests using:\n```bash\nsudo python setup.py test\n```\n\n### Using cffi_re2\n\n*cffi_re2* is mostly compatible to the *re* module from the Python standard library and exposes the same interface. In almost all cases you can use the same source code for both libraries. The flags in `cffi_re2` are exactly the same as those in `re`, so you can e.g. use `re.IGNORECASE` in `cffi_re2.compile` and vice versa.\n\nOne way to use *cffi_re2* is:\n\n```python\nimport cffi_re2 as re\n```\n\nNote however, that, due to the design of the [*RE2*](https://github.com/google/re2) library, some syntax elements like zero-width lookaheads or lookbehinds are [not supported](https://github.com/google/re2/wiki/Syntax).\n\nWhen using those syntax elements, the backend reports a syntax error when calling `cffi_re2.compile`, for example:\n\n```\nValueError: invalid perl operator: (?<\n```\n\nOne workaround is to convert your regex into a group-capturing form and select the appropriate group later. For larger sets of complex regular expressions, this is often not feasible, however.\n\nIn this case, it is recommended to use a hybrid approach, i.e. falling back to *re* if *cffi_re2* fails to compile an expression.\n\n```python\nimport re\nimport cffi_re2\n\ndef compileRegex(rgx, flags=0):\n    try:\n        return cffi_re2.compile(rgx, flags)\n    except ValueError:\n        return re.compile(rgx, flags)\n``` \n\nNote that in the current implementation there are still several known and unknown incompatibilities between *cffi_re2* and *re*. If you encounter issues, please report them as a bug.\n\n### Benchmarks\n\n### About\n\n*cffi_re2* was originally developed by [Liang Zhaohao](https://github.com/vls). Many new features and improvements were contributed by [Uli K\u00f6hler](https://github.com/ulikoehler).\n\nThe library is licensed under the MIT license (see LICENSE file).",
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