Matthew Barnett added the comment:
The 4th argument of re.sub is the maximum count (0 means unlimited).
>>> help(re.sub)
Help on function sub in module re:
sub(pattern, repl, string, count=0, flags=0)
Return the string obtained by replacing the leftmost
non-overlapping occurrences of the pattern in string by the
replacement repl. repl can be either a string or a callable;
if a string, backslash escapes in it are processed. If it is
a callable, it's passed the match object and must return
a replacement string to be used.
The value of re.MULTILINE is 8:
>>> re.MULTILINE
8
therefore it'll perform a maximum of 8 substitutions.
In summary: not a bug.
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<http://bugs.python.org/issue24071>
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