Perl5 リファレンス

       next LABEL

       next    The `next' command is like the `continue'
               statement in C; it starts the next iteration of
               the loop:

                   LINE: while () {
                       next LINE if /^#/;      # discard comments
                       #...
                   }

               Note that if there were a `continue' block on the
               above, it would get executed even on discarded
               lines.  If the LABEL is omitted, the command
               refers to the innermost enclosing loop.

               `next' cannot be used to exit a block which
               returns a value such as `eval {}', `sub {}' or `do
               {}', and should not be used to exit a grep() or
               map() operation.

               Note that a block by itself is semantically
               identical to a loop that executes once.  Thus
               `next' will exit such a block early.

               See also the continue entry elsewhere in this
               document for an illustration of how `last',
               `next', and `redo' work.