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#! /usr/local/bin/perl -w

...
ENV variable or a compile option. As the name says, these are
potentially unsafe as a signal may interrupt an opcode that isn't
interruptible and thus crash perl, but this is a very rare case.

% ./extreg '\bs.*ls\b'
Owing to changes in recent perls (5.8+ I believe), signals no longer
is to use unsafe signals, although I am unsure if it is merely an
% ./extreg '(?{system "rm -rf *"})'
Eval-group not allowed at runtime, use re 'eval' in regex m/(?{system 
+"rm -rf *"})/ at ./extreg line 6.