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Tests of substitution
=====================
This first test is just looking to replace things between parentheses
with an empty string.
>>> import hashlib
>>> import gzip
>>> import re2
>>> re2.set_fallback_notification(re2.FALLBACK_EXCEPTION)
>>> import warnings
>>> warnings.filterwarnings('ignore', category=DeprecationWarning)
>>> with gzip.open('tests/wikipages.xml.gz', 'rb') as tmp:
... data = tmp.read()
>>> print(hashlib.md5(re2.sub(b'\(.*?\)', b'', data)).hexdigest())
b7a469f55ab76cd5887c81dbb0cfe6d3
>>> re2.set_fallback_notification(re2.FALLBACK_QUIETLY)
Issue #26 re2.sub replacements with a match of "(.*)" hangs forever
>>> re2.sub('(.*)', r'\1;replacement', 'original')
'original;replacement;replacement'
>>> re2.sub('(.*)', lambda x: x.group() + ';replacement', 'original')
'original;replacement;replacement'
>>> re2.subn("b*", lambda x: "X", "xyz", 4)
('XxXyXzX', 4)
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