Perl学习笔记(2)

很简单的E文，就不翻译了:-)

1: $&, which is the part of the string that matched the regular expression

2: $`, which is the part of the string before the part that matched

3: $', which is the part of the string after the part that matched

For example:

$_ = "this is a sample string";

/sa.*le/; # matches "sample" within the string

             # $` is now "this is a "

             # $& is now "sample"

             # $' is now " string"