New submission from ProFatXuanAll <profatxuan...@gmail.com>:
When I run the following code, I expected to get output result `['i am next
line with [unk]']`, but instead I get the original list in `data`.
Code snippet
```py
import re
data = [
'= hello =',
'i am next line with <unk>',
]
pttn = re.compile(r'=.*=')
samples = filter(lambda sample: not pttn.match(sample), data)
pttn = re.compile(r'<unk>')
samples = map(lambda sample: pttn.sub('[unk]', sample), samples)
print(list(samples))
```
I suspect that is the cache provide by `re.compile` cause the problem.
The `sub` function in `map` is somehow begin link to the first `pttn`.
If I instead rename the second `pttn` to `pttn2`, then it work magically, but
this is not expected.
----------
components: Regular Expressions
files: rebug.py
messages: 381907
nosy: ProFatXuanAll, ezio.melotti, mrabarnett
priority: normal
severity: normal
status: open
title: wrongly cache pattern by re.compile
type: behavior
versions: Python 3.8
Added file: https://bugs.python.org/file49625/rebug.py
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue42475>
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