=over =item $[ X<$[> This variable stores the index of the first element in an array, and of the first character in a substring. The default is 0, but you could theoretically set it to 1 to make Pe...

=over =item %ENV X<%ENV> The hash C<%ENV> contains your current environment. Setting a value in C<ENV> changes the environment for any child processes you subsequently C<fork()> off. As of v5.18.0,...

=over =item $POSTMATCH =item $' X<$'> X<$POSTMATCH> X<@-> The string following whatever was matched by the last successful pattern match. (See L</Scoping Rules of Regex Variables>). Example: local ...

=over =item $PREMATCH =item $` X<$`> X<$PREMATCH> The string preceding whatever was matched by the last successful pattern match. (See L</Scoping Rules of Regex Variables>). See L</Performance issu...

=over =item @ARG =item @_ X<@_> X<@ARG> Within a subroutine the array C<@_> contains the parameters passed to that subroutine. Inside a subroutine, C<@_> is the default array for the array operator...

=over =item ${^ENCODING} X<${^ENCODING}> This variable is no longer supported. It used to hold the I<object reference> to the C<Encode> object that was used to convert the source code to Unicode. I...

=over =item %^H X<%^H> The C<%^H> hash provides the same scoping semantics as L<C<$^H>|/$^H>. This makes it useful for implementing lexically scoped pragmas. See L<perlpragma>. All the entries are ...

=over =item ${^CHILD_ERROR_NATIVE} X<$^CHILD_ERROR_NATIVE> The native status returned by the last pipe close, backtick (C<``>) command, successful call to C<wait()> or C<waitpid()>, or from the C<s...

=over =item $# X<$#> C<$#> was a variable that could be used to format printed numbers. After a deprecation cycle, its magic was removed in Perl v5.10.0 and using it now triggers a warning: C<$# is...

=over =item IO::Handle->output_field_separator( EXPR ) =item $OUTPUT_FIELD_SEPARATOR =item $OFS =item $, X<$,> X<$OFS> X<$OUTPUT_FIELD_SEPARATOR> The output field separator for the print operator. ...