PY: revert group sequences of chars#12514
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If I remember correctly the purpose of the change that gets reverted in this PR is to reduce the number of regex AST nodes by grouping sequences of normal characters into a single node instead of separate nodes for each character. Without this I think there is a risk of performance degradation for large strings (that may not even be actual regular expressions). |
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THIS PR IS FOR NOTE-TAKING AND DISCUSSION, NOT FOR MERGING (yet)
This is a partial revert of https://github.com/github/codeql/pull/8166/files
I've updated the test-output to reflect the new results we gain from this revert.
This only touches Python, but Ruby/Java is also relevant.
CVE-2017-18361: TP
(Other security issue): TP (with constant-folding).