ch12.106_best

来自「Perl Best Practices the source code」· 106_BEST 代码 · 共 24 行

##############################################################################
##   Code fragment (Recommended) from Chapter 12 of "Perl Best Practices"   ##
##     Copyright (c) O'Reilly & Associates, 2005. All Rights Reserved.      ##
##  See: http://www.oreilly.com/pub/a/oreilly/ask_tim/2001/codepolicy.html  ##
##############################################################################


# Standard modules...
use strict;
use warnings;
use IO::Prompt;
use Carp;
use English qw( -no_match_vars );
use Data::Alias;
use Readonly;

Readonly my $ITEM => qr/\d/xms;
my $str = '(1,2,3,4,5,6,7,8,9,';

croak 'oops!' if $str =~

m{ [(]  $ITEM  (?> (?: , $ITEM )* )  [)] }xms;