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This patch is more complex than the old version because it handles inner subexpressions like (a|())* where \2 must not be set. The idea is to leave empty subexpressions revertable until we are sure that they are valid -- in this case, \2 will be reverted together with \1 as soon as the empty occurrence of \1 is found. On the contrary, for something like (a|()b)*, \2 will still be left revertable, but then it will always be accepted together with \1 because the latter cannot be empty. The patch includes fixes for the PCRE, BOOST and SPENCER test vectors as well. It also passes the new tests for a{0}{0} that Jakub introduced a few days ago. Paolo
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regex-fix-opt-subexp.patch
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