[issue10139] regex A|B : both A and B match, but B is wrongly preferred

[Χρήστος Γεωργίου (Christos Georgiou)]

Χρήστος Γεωργίου (Christos Georgiou) <tzot at users.sourceforge.net> added the comment:

As I see it, it's more like:

>>> re.search('a.*c|a.*|.*c', 'abc').group()

producing 'bc' instead of 'abc'. Substitute "(?<=^A)" for "a" and "(?=Z$)" for "c" in the pattern above.

In your example, the first part ('bc') does not match the whole string ('abc'). In my example, the first part ('(?<=^A).*(?=Z$)') matches the whole string ('A***Z').

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<http://bugs.python.org/issue10139>
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