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Diffstat (limited to 'pod/perlre.pod')
| -rw-r--r-- | pod/perlre.pod | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/pod/perlre.pod b/pod/perlre.pod index e040f09c34..c997a9ede0 100644 --- a/pod/perlre.pod +++ b/pod/perlre.pod @@ -1035,6 +1035,12 @@ The following pattern matches a parenthesized group: See also C<(?PARNO)> for a different, more efficient way to accomplish the same task. +For reasons of security, this construct is forbidden if the regular +expression involves run-time interpolation of variables, unless the +perilous C<use re 'eval'> pragma has been used (see L<re>), or the +variables contain results of C<qr//> operator (see +L<perlop/"qr/STRING/imosx">). + Because perl's regex engine is not currently re-entrant, delayed code may not invoke the regex engine either directly with C<m//> or C<s///>), or indirectly with functions such as C<split>. |