bpo-30340: Enhanced regular expressions optimization. #1542
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This increased the performance of matching some patterns up to 25 times.
|
@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
added a commit
to duo-labs/dlint
that referenced
this pull request
Dec 28, 2019
$ 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
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
This increased the performance of matching some patterns up to 25 times.