Simple function to enforce whitelist (ensure that a string includes only certain characters) and blacklist (ensure that a string absolutely does not include certain characters).
Want to make sure that a string includes only certain characters? Create a whitelist. Want to make sure that a string absolutely does not include certain characters? Create a blacklist. Both are easy to do with this simple function and structure.
21 August 2007
Leaders and contributors
Resources and communication
Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the page “GNU Free Documentation License”.
The copyright and license notices on this page only apply to the text on this page. Any software or copyright-licenses or other similar notices described in this text has its own copyright notice and license, which can usually be found in the distribution or license text itself.