[docs] [issue23532] add example of 'first match wins' to regex "|" documentation?

[Matthew Barnett]

Matthew Barnett added the comment:

Not quite all. POSIX regexes will always look for the longest match, so the order of the alternatives doesn't matter, i.e. x|xy would give the same result as xy|x.

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<http://bugs.python.org/issue23532>
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