有人能告诉我一个例子,它展示了这两个变量的不同行为($^ N和$)？
解决方法
从
perldoc perlvar开始：
@H_502_18@$+: The text matched by the last bracket of the last successful
search pattern.
与
@H_502_18@$^N: The text matched by the used group most-recently closed (i.e.
the group with the rightmost closing parenthesis) of the last
successful search pattern.
这应该说明不同之处：
#!/usr/bin/perl
use strict; use warnings;
my $s = '12345';
if ( $s =~ /(1([0-9]))/ ) {
print "$_\n" for $+,$^N;
}
输出：
2 12
