[pcre-dev] [Bug 767] ^ in else part of if-then-else regexp

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Autor: Philip Hazel
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Para: pcre-dev
Asunto: [pcre-dev] [Bug 767] ^ in else part of if-then-else regexp
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http://bugs.exim.org/show_bug.cgi?id=767




--- Comment #2 from Philip Hazel <ph10@???> 2008-10-06 17:29:02 ---
On Mon, 6 Oct 2008, Michael Graham wrote:

> I am trying to get the following regexp to work:
>
> (?(?=.*b)b|^)


Thank you for the report. I have ascertained that there is definitely a
bug in PCRE. It thinks (incorrectly) that the match must be at the start
or follow a newline. However, I am not working on PCRE just at the
moment (there was a new release recently) so it will be some time before
I have the time to investigate the actual code to see what is going
wrong. I suspect it is treating the condition as something that really
has to be matched, which of course it shouldn't. If you can rewrite the
regex so as not to use .* it would probably get round the issue.

Regards,
Philip


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