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For more on the CGI module, read the documentation at http://search.cpan.org/dist/CGI.pm/CGI.pm.
For more on web scripting security, read the WWW security FAQ at http://www.w3.org/Security/faq.
Regular expressions are a powerful tool. There are many good books on regular expressions, but try to choose one that focuses on Perl (there are slight variations in the regular expression syntax used in different tools). We recommend you read Mastering Regular Expressions by Jeffrey E. F. Friedl (O’Reilly).

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