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http://bugs.exim.org/show_bug.cgi?id=1190
Summary: lookaround doesn't work with startoffset
Product: PCRE
Version: 8.21
Platform: Other
OS/Version: Windows
Status: NEW
Severity: bug
Priority: low
Component: Code
AssignedTo: ph10@???
ReportedBy: alehotsky@???
CC: pcre-dev@???
Trying to match the pattern (from page 66 of Mastering Regular Expressions, 3rd
Edition)
(?<=\d)(?=(\d\d\d)+(?!\d)
with the source string "1234567"
This fails if my search loop uses the startoffset argument to pcre_exec() to
advance thru the search string (leaving the subject and length unchanged as I
find successive match points).
But it does work if I advance the subject ptr and decrement the length, and use
a zero for the startoffset on each call.
Is that the way it's expected to work? I'm actually surprised at that, because
it's not at all clear to me that pcre ought to be looking backwards from the
subject pointer - there's really no guarantee of what might be at a negative
offset from the start pointer.
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