Serhiy Storchaka added the comment:
re.compile can also raise ValueError and OverflowError. Agree that may be these
exceptions can be converted to re.error.
But it can also raise MemoryError, and KeyboardInterrupt. And these exceptions
can't be converted to re.error.
RecursionError is closer to the latter case. It depends not only on the pattern
itself, but on the place where it is called. A pattern that is compiled
successfully at top level can produce a RecursionError if it is compiled deeply
in the recursion.
>>> import re
>>> def r(n):
... if not n:
... return re.compile('x')
... return r(n-1)
...
>>> r(990)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "<stdin>", line 4, in r
File "<stdin>", line 4, in r
...
File "<stdin>", line 4, in r
File "<stdin>", line 3, in r
File "/home/serhiy/py/cpython/Lib/re.py", line 224, in compile
return _compile(pattern, flags)
File "/home/serhiy/py/cpython/Lib/re.py", line 293, in _compile
p = sre_compile.compile(pattern, flags)
File "/home/serhiy/py/cpython/Lib/sre_compile.py", line 555, in compile
p = sre_parse.parse(p, flags)
File "/home/serhiy/py/cpython/Lib/sre_parse.py", line 822, in parse
source = Tokenizer(str)
File "/home/serhiy/py/cpython/Lib/sre_parse.py", line 225, in __init__
self.__next()
RecursionError: maximum recursion depth exceeded
>>> re.compile('x')
re.compile('x')
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