Chapter 8 Access Restrictions
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To use Website Blocking by Regular Expression, enter the expression you
wish to block in the fields provided.
Note
: A regular expression is a string used to describe or match a set of
strings. You can block websites that use strings encompassed by the regular
expressions you enter on this screen. Enter each regular expression in a
separate field.
Regular Expression Syntax
:
.
any character
^
start of a line
$
end of a line
*
match zero or many times
?
match zero or one time
+
match one or more times
{m,n}
match from m to n times (m <= n)
{n}
match exactly n times
[a-c]
character set
[^a-c]
negative charset
|
or
(“ and “)
brackets for grouping
\xx
escaped character
4
Use any combination of the following options to block services in the Blocked
Services section to filter access to various applications accessed over the Internet,
such as FTP or telnet.
Block a preset applications
—The block services select list offers a choice of
preset applications. For multiple selection, press the
Ctrl
or
Shift
key.
Note
: If you select a preset application, its port numbers and protocol are
displayed and can not be changed.
Block a new service
—If the application you want to block is not listed, select
the
Service
link; then, you can enter the port range and protocol for the
service you wish to block. The new service is added to the list.
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