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Testing re2 on buffer object
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>>> import re2
>>> import mmap
>>> re2.set_fallback_notification(re2.FALLBACK_EXCEPTION)
>>> tmp = open("tests/cnn_homepage.dat", "rb+")
>>> data = mmap.mmap(tmp.fileno(), 0)
>>> len(list(re2.finditer(b'\\w+', data)))
14230
>>> data.close()
>>> tmp.close()
>>> re2.set_fallback_notification(re2.FALLBACK_QUIETLY)
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