bpo-30340: Enhanced regular expressions optimization.#1542
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serhiy-storchaka merged 6 commits intoMay 14, 2017
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This increased the performance of matching some patterns up to 25 times.
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@serhiy-storchaka, thanks for your PR! By analyzing the history of the files in this pull request, we identified @niemeyer, @birkenfeld and @rhettinger to be potential reviewers. |
mschwager
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$ python --version Python 3.6.9 $ time python -c "import re; re.search(r'([a-c]|[c-e])+z', 'c' * 64)" *Spins*... $ time python -c "import re; re.search(r'(c|[c-e])+z', 'c' * 64)" *Spins*... $ python --version Python 3.7.4 $ time python -c "import re; re.search(r'([a-c]|[c-e])+z', 'c' * 64)" real 0m 0.09s user 0m 0.07s sys 0m 0.01s $ time python -c "import re; re.search(r'(c|[c-e])+z', 'c' * 64)" real 0m 0.04s user 0m 0.03s sys 0m 0.01s For more information see python/cpython#1542
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This increased the performance of matching some patterns up to 25 times.