New issue 2758: strange behavior in re.sub
https://bitbucket.org/pypy/pypy/issues/2758/strange-behavior-in-resub
Joseph Joseph:
### Environment ###
```
Python 2.7.13 (84a2f3e6a7f88f2fe698e473998755b3bd1a12e2, Oct 05 2017, 16:31:59)
[PyPy 5.9.0 with GCC 4.2.1 Compatible Apple LLVM 9.0.0 (clang-900.0.37)] on
darwin
```
Given the following code:
```
#!python
import re
class Proxy:
def __init__(self):
self.matches = []
def repl(self, match):
self.matches.append(match)
return ""
def main():
pat = "\$\{(\w*)\}"
value = "the name is ${joseph}, the name is ${alice}"
proxy = Proxy()
compiled_pat = re.compile(pat)
compiled_pat.sub(proxy.repl, value)
for match in proxy.matches:
print(match.groups())
if __name__ == "__main__":
main()
```
The result of execution is:
```
(None,)
(None,)
```
The expected result is:
```
('joseph',)
('alice',)
```
But if we changed a little bit in Proxy.repl as following, the result will be
correct.
```
#!python
class Proxy:
def __init__(self):
self.matches = []
def repl(self, match):
self.matches.append(match)
print match.groups() . # <----------- added this line
return ""
```
this bug also exists in
```
Python 3.5.3 (d72f9800a42b46a8056951b1da2426d2c2d8d502, Oct 07 2017, 08:21:37)
[PyPy 5.9.0-beta0 with GCC 4.2.1 Compatible Apple LLVM 9.0.0 (clang-900.0.37)]
on darwin
```
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