Matthew Barnett added the comment:

In a regex, '+' is a metacharacter meaning "repeated one or more times".

"libstdc+" will match "libstd" followed by "c" repeated one or more times.

"libstdc++" will match "libstd" followed by "c" repeated one or more times, but 
then there's another "+", which it takes to mean that you want the repeat to be 
repeated, hence the exception.

'*' is also a metacharacter, this one meaning "repeated zero or more times".

In summary, not a bug.

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<http://bugs.python.org/issue22119>
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