=over =item ${^SAFE_LOCALES} X<${^SAFE_LOCALES}> Reflects if safe locale operations are available to this perl (when the value is 1) or not (the value is 0). This variable is always 1 if the perl h...

=over =item ${^POSTMATCH} X<${^POSTMATCH}> It is only guaranteed to return a defined value when the pattern was compiled or executed with the C</p> modifier. This is similar to C<$'> (C<$POSTMATCH>...

=over =item $DEBUGGING =item $^D X<$^D> X<$DEBUGGING> The current value of the debugging flags. May be read or set. Like its L<command-line equivalent|perlrun/B<-D>I<letters>>, you can use numeric ...

=over =item $* X<$*> C<$*> was a variable that you could use to enable multiline matching. After a deprecation cycle, its magic was removed in Perl v5.10.0. Using it now triggers a warning: C<$* is...

=over =item $WARNING =item $^W X<$^W> X<$WARNING> The current value of the warning switch, initially true if B<-w> was used, false otherwise, but directly modifiable. See also L<warnings>. Mnemonic...

=over =item srand EXPR X<srand> X<seed> X<randseed> =item srand Sets and returns the random number seed for the L<C<rand>|/rand EXPR> operator. The point of the function is to "seed" the L<C<rand>|...

=over =item splice ARRAY,OFFSET,LENGTH,LIST X<splice> =item splice ARRAY,OFFSET,LENGTH =item splice ARRAY,OFFSET =item splice ARRAY Removes the elements designated by OFFSET and LENGTH from an arra...

=over =item shift ARRAY X<shift> =item shift Removes and returns the B<first> element of an array. This shortens the array by one and moves everything down. my @arr = ('cat', 'dog'); my $item = shi...

=over =item atan2 Y,X X<atan2> X<arctangent> X<tan> X<tangent> Returns the arctangent of Y/X in the range -PI to PI. For the tangent operation, you may use the L<C<Math::Trig::tan>|Math::Trig/B<tan...

=over =item lcfirst EXPR X<lcfirst> X<lowercase> =item lcfirst Returns the value of EXPR with the first character lowercased. This is the internal function implementing the C<\l> escape in double-q...