Serhiy Storchaka added the comment:
Startup-time:
$ ./python -m timeit -s 'import re'
're.compile("([^\ud800-\udbff]|\A)[\udc00-\udfff]([^\udc00-\udfff]|\Z)").search;
re.purge()'
100 loops, best of 3: 4.16 msec per loop
$ ./python -m timeit -s 'import re' 're.purge()'
're.compile("[\udc80-\udcff]").search'
100 loops, best of 3: 5.72 msec per loop
$ ./python -m timeit 'h=lambda s, p=set(map(chr, range(0xDC80, 0xDCFF+1))):
any(c in p for c in s)'
10000 loops, best of 3: 60.5 usec per loop
$ ./python -m timeit -s 'import re' 're.purge()'
're.compile("(?![^\udc80-\udcff])").search'
1000 loops, best of 3: 401 usec per loop
$ ./python -m timeit -s 'import re' 're.purge()'
're.compile("[^\udc80-\udcff]*\Z").match'
1000 loops, best of 3: 427 usec per loop
Runtime:
$ ./python -m timeit -s 'import re;
h=re.compile("([^\ud800-\udbff]|\A)[\udc00-\udfff]([^\udc00-\udfff]|\Z)").search;
s = "A"*1000' 'h(s)'
1000 loops, best of 3: 245 usec per loop
$ ./python -m timeit -s 'import re; h=re.compile("[\udc80-\udcff]").search; s
= "A"*1000' 'h(s)'
10000 loops, best of 3: 30.1 usec per loop
$ ./python -m timeit -s 'h=lambda s, p=set(map(chr, range(0xDC80, 0xDCFF+1))):
any(c in p for c in s); s = "A"*1000' 'h(s)'
10000 loops, best of 3: 164 usec per loop
$ ./python -m timeit -s 'import re;
h=re.compile("(?![^\udc80-\udcff])").search; s = "A"*1000' 'h(s)'
10000 loops, best of 3: 98.3 usec per loop
$ ./python -m timeit -s 'import re; h=re.compile("[^\udc80-\udcff]*\Z").match;
s = "A"*1000' 'h(s)'
10000 loops, best of 3: 34.6 usec per loop
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue11454>
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