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mickael@… — Tue, 05 Aug 2008 00:31:40 GMT

attachment → regex-bug.cpp

Test case for the problem.

status changed; resolution set

John Maddock — Tue, 05 Aug 2008 10:56:48 GMT

status new → closed
resolution → invalid

I believe this is a misunderstanding of how regular expressions work: if the expression is [a-z]* then it is perfectly legal to match a zero-length string if the * operator repeats zero times. So for example [a-z]* matched against the string " abc " can find 4 matches:

the zero length string at the start of the " abc ".
the string "abc".
the zero length string after the "c".
the zero length string at the end of " abc ".

When a zero length string is matched, then sub_match::first == sub_match::second and sub_matched::matched == true.

Probably you meant to use [a-z]+ as the regular expression?

If this doesn't clarify the issue, or if I've misunderstood, please reopen the ticket.

HTH & bonjour, John Maddock.

mickael@… — Tue, 05 Aug 2008 17:45:37 GMT

Bonjour :)

You're right, I misused regex_search. I correct my code to increment the start iterator when first == end, and add a test start != end before regex_search.

Even Boost::regex stress me a lot, its approach is great.

Thanks for your fastness !

Boost C++ Libraries: Ticket #2165: regex_search match but regex_match is not filled

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status changed; resolution set