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#!/usr/bin/env perl -T ... say '[1]', $1, '[1]'; say '[2]', $2, '[2]'; say '[', $_ + 3, ']', $captures[$_], '[', $_ + 3, ']' for 0 .. $#captu +res;
$ pm_1047667_regex.pl [1]3[1] ... [4] [5]ccccc [5]
$ pm_1047667_regex.pl [1]2[1] ... [3] [4]bbbb [4]
$ pm_1047667_regex.pl [1]4[1] ... [5]ccccc [5] [6]ddddd[6]