Php validating phone number regex
Ironically, websites commonly used by students to circumvent filters and access blocked content often include a proxy, from which the user can then access the websites that the filter is trying to block.
Requests may be filtered by several methods, such as a URL or DNS blacklists blacklist, URL regex filtering, MIME filtering, or content keyword filtering.
It may also communicate to daemon-based and/or ICAP-based antivirus software to provide security against virus and other malware by scanning incoming content in real time before it enters the network.
The resultant database is then corrected by manual labor based on complaints or known flaws in the content-matching algorithms.
Some products have been known to employ content analysis techniques to look for traits commonly used by certain types of content providers.
Blacklists are often provided and maintained by web-filtering companies, often grouped into categories (pornography, gambling, shopping, social networks, etc.).
Communication between two computers (shown in grey) connected through a third computer (shown in red) acting as a proxy.
Bob does not know to whom the information is going, which is why proxies can be used to protect privacy.
A content filtering proxy will often support user authentication to control web access.