You could use a module or write the 1 line of code to do the job.
Here's another way.
my $file_name = '';
$tst = 'test\testweb\testlibb\file.-finaltestfla.jar';

$file_name = $1 if ($tst =~ m/\A\S+\\(.*?\.jar)\z/i);

print $file_name . "\n" . $tst;

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In reply to Re: extract file name from a dynamic path by SFLEX
in thread extract file name from a dynamic path by dani_cv

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