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| author | Karl Williamson <khw@cpan.org> | 2019-03-17 22:11:04 -0600 |
|---|---|---|
| committer | Karl Williamson <khw@cpan.org> | 2019-03-17 22:17:29 -0600 |
| commit | 6ef7fe531911e0b41ffcc04c1d6b6ec25a8b1bc9 (patch) | |
| tree | 0fc833fa2bf0171a01f395300906e586a316485f /pod/perlvar.pod | |
| parent | 3b89859ad83deaeff7c1ee7911d181ef10236879 (diff) | |
| download | perl-6ef7fe531911e0b41ffcc04c1d6b6ec25a8b1bc9.tar.gz | |
PATCH: [perl #131551] Too deep regex compilation recursion
This patch, started by Yves Orton, and refined in consultation with Tony
Cook, imposes a maximum depth of unclosed left parentheses, at which
point it croaks. This is to prevent the segfault in the ticket.
The patch adds a variable that can be set to increase or decrease this
limit at run time (actually regex compilation time) should this be
desired, and hence our pre-determined limit of 1000 can be changed if
necessary.
Diffstat (limited to 'pod/perlvar.pod')
| -rw-r--r-- | pod/perlvar.pod | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/pod/perlvar.pod b/pod/perlvar.pod index d67d4cd8b1..b42cbe2251 100644 --- a/pod/perlvar.pod +++ b/pod/perlvar.pod @@ -1249,6 +1249,17 @@ regular expression assertion (see L<perlre>). May be written to. This variable was added in Perl 5.005. +=item ${^RE_COMPILE_RECURSION_LIMIT} +X<${^RE_COMPILE_RECURSION_LIMIT}> + +The current value giving the maximum number of open but unclosed +parenthetical groups there may be at any point during a regular +expression compilation. The default is currently 1000 nested groups. +You may adjust it depending on your needs and the amount of memory +available. + +This variable was added in Perl v5.30.0. + =item ${^RE_DEBUG_FLAGS} X<${^RE_DEBUG_FLAGS}> |