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http://bugs.exim.org/show_bug.cgi?id=872
--- Comment #1 from Philip Hazel <ph10@???> 2009-08-03 18:29:29 ---
On Mon, 3 Aug 2009, Mike wrote:
> text to match = " th is i s a t e s t "
>
> regexp1 =
> "(.*\n*)*(.*\n*)*(.*\n*)*(.*\n*)*(.*\n*)*(.*\n*)*(.*\n*)*(.*\n*)*(.*\n*)*(.*\n*)*(.*\n*)*(.*\n*)*(.*\n*)*(.*\n*)*(.*\n*)*(.|\n)(.*\n*)*(.|\n)"
>
> regexp2="(.*\n*)*(.*\n*)*(.*\n*)*(.*\n*)*(.*\n*)*(.*\n*)*(.*\n*)*(.*\n*)*(.*\n*)*(.*\n*)*(.*\n*)*(.*\n*)*(.*\n*)*(.*\n*)*(.|\n)(.*\n*)*(.*\n*)*(.|\n)"
>
> Results:
> regexp1 is failed to match the text. (FAIL)
> regexp2 successfully matches the text.(OK)
>
> Expected results:
> both regual expressions should succefully match the text.
>
> Reproduced at version 7.9.
So have I, but it's not a bug (I put the data a file called "zz"):
-----------------------------------------------------------------------
$ pcretest zz
PCRE version 7.9 2009-04-11
"(.*\n*)*(.*\n*)*(.*\n*)*(.*\n*)*(.*\n*)*(.*\n*)*(.*\n*)*(.*\n*)*(.*\n*)*(.*\n*)*(.*\n*)*(.*\n*)*(.*\n*)*(.*\n*)*(.*\n*)*(.|\n)(.*\n*)*(.|\n)"
th is i s a t e s t
Error -8
-----------------------------------------------------------------------
Error -8 is PCRE_ERROR_MATCHLIMIT (and it takes an noticeable time to
give this). This is the second report in a week of a similar problem.
Note that nested unlimited repeats can easily give this problem. Please
read the "pcreperform" man page.
Using pcretest's -M option, I get (after about a minute):
-----------------------------------------------------------------------
$ pcretest -M zz
PCRE version 7.9 2009-04-11
"(.*\n*)*(.*\n*)*(.*\n*)*(.*\n*)*(.*\n*)*(.*\n*)*(.*\n*)*(.*\n*)*(.*\n*)*(.*\n*)*(.*\n*)*(.*\n*)*(.*\n*)*(.*\n*)*(.*\n*)*(.|\n)(.*\n*)*(.|\n)"
th is i s a t e s t
Minimum match() limit = 10321961
Error -8
"(.*\n*)*(.*\n*)*(.*\n*)*(.*\n*)*(.*\n*)*(.*\n*)*(.*\n*)*(.*\n*)*(.*\n*)*(.*\n*)*(.*\n*)*(.*\n*)*(.*\n*)*(.*\n*)*(.|\n)(.*\n*)*(.*\n*)*(.|\n)"
th is i s a t e s t
Minimum match() limit = 5455913
Minimum match() recursion limit = 75
-----------------------------------------------------------------------
The default match limit is 10000000, enough for the second pattern, but
not enough for the first.
Regards,
Philip
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