Perl file scanner

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In environments where untrusted regular expressions are evaluated, a remote attacker could possibly use this issue to cause Perl to crash, resulting in a denial of service, or possibly execute arbitrary code.

Hugo van der Sanden and Slaven Rezic discovered that Perl incorrectly handled certain regular expressions. Register Login. Files News Users Authors. Showing 1 - 25 of 1, Perl Files. Page 1 of 57 Jump to page Back 1 2 3 4 5 Next. If you run the above script you will see it prints First row done Why is there an empty row before the "done" you might ask. That's because the readline operator read all the line, including the trailing newline.

When we used print to print it out, we added a second newline. As with the case of reading from STDIN, here too, we usually don't need that trailing newline so we will use chomp to remove it. Reading more than one line Once we know how to read one line we can go ahead and put the readline call in the condition of a while loop.

If that line has anything in it, that will evaluate to true. After we read the last line, in the next iteration the readline operator will return undef which is false. The while-loop will terminate. An edge-case There is an edge-case though when the very last line has a single 0 in it, without a trailing newline.

The above code would evaluate that line to false and the loop would not be executed. For more information on module installation, please visit the detailed CPAN module installation guide. All rights reserved. Fork metacpan. Keyboard Shortcuts. Global s Focus search bar?

Bring up this help dialog GitHub g p Go to pull requests g i go to github issues only if github is preferred repository.