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Help Please

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From:
Jyoti
Date:
September 10, 2009 04:56
Subject:
Help Please
Message ID:
de92d70c0909100456y8fc5630ma793be05c317c4b6@mail.gmail.com
Can someone explain me what these symbols mean in regular expression:

my $trim = sub {local($_)=shift;
     $$_ =~ s/^\s*//;
     $$_ =~ s/\s*$//;};

Thanks.
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