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http://bugs.exim.org/show_bug.cgi?id=1092
Summary: OP_RECURSIVE and OP_CLOSE
Product: PCRE
Version: 8.11
Platform: All
OS/Version: All
Status: NEW
Severity: bug
Priority: medium
Component: Code
AssignedTo: ph10@???
ReportedBy: hzmester@???
CC: pcre-dev@???
I had a feeling before that the static analysis generating OP_CLOSE opcodes may
fail when we combine it with OP_RECURSIVE. Now I have a proof:
Pattern: "(?1)(?:(b(*ACCEPT))){0}" Subject: "b"
0 33 Bra
3 6 Once
6 16 Recurse
9 6 Ket
12 Skip zero
13 17 Bra
16 11 CBra 1
21 NC b
23 Close 1
26 *ACCEPT
27 11 Ket
30 17 Ket
33 33 Ket
36 End
Capturing brackets result:
0, 1, -1, 1
Could we do something clever in such cases? Looks really difficult to fix this.
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