Arnim Rupp <[email protected]> added the comment:
some more observations, which might be helpful in tracking it down:
x$ is much faster than ^x
A$ is as slow as ^x
$ python3 -m timeit -s "a = 'A'*100000000" "import re" "re.search('x$', a)"
10 loops, best of 5: 32.9 msec per loop
$ python3 -m timeit -s "a = 'A'*100000000" "import re" "re.search('A$', a)"
1 loop, best of 5: 802 msec per loop
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<https://bugs.python.org/issue42885>
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