Or of course there is split 

my $file_name = ( split m{/}, $0 )[-1];

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not to mention substr and rindex 
my $file_name = substr $0, 1 + rindex $file, '/';

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if you insist on regular expressions then this is simpler 
my ( $file_name ) = $0 =~ m{([^/]+)$};

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If you care about portability, and one day you will, even if its just to port your code back into your brain in six months time, you will stick to Corion's suggested 

use File::Basename qw(basename);

my $file_name = basename $0;

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In reply to Re^3: get file name? by hipowls
in thread get file name? by adrive

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