Fortinet 100A manual 337, To block any word in a phrase, To block purposely misspelled words

Spam filter		Configuring the banned word list
	Table 30: Perl regular expression formats
	[Aa]bc	either of Abc and abc
	[abc]+	any (nonempty) string of a's, b's and c's (such as a, abba, acbabcacaa)
	[^abc]+	any (nonempty) string which does not contain any of a, b and c (such as defg)
	\d\d	any two decimal digits, such as 42; same as \d{2}
	/i	makes the pattern case insensitive. For example, /bad language/i blocks
		any instance of bad language regardless of case.
	\w+	a “word”: a nonempty sequence of alphanumeric characters and low lines
		(underscores), such as foo and 12bar8 and foo_1
	100\s*mk	the strings 100 and mk optionally separated by any amount of white space
		(spaces, tabs, newlines)
	abc\b	abc when followed by a word boundary (e.g. in abc! but not in abcd)
	perl\B	perl when not followed by a word boundary (e.g. in perlert but not in perl stuff)
	\x	tells the regular expression parser to ignore white space that is neither
		backslashed nor within a character class. You can use this to break up your
		regular expression into (slightly) more readable parts.
	/x	used to add regexps within other text. If the first character in a pattern is
		forward slash '/', the '/' is treated as the delimiter. The pattern must contain a
		second '/'. The pattern between ‘/’ will be taken as a regexp, and anything
		after the second ‘/’ will be parsed as a list of regexp options ('i', 'x', etc). An
		error occurs If the second '/' is missing. In regular expressions, the leading
		and trailing space is treated as part of the regular expression.

Examples

To block any word in a phrase

/blockanyword/

To block purposely misspelled words

Spammers often insert other characters between the letters of a word to fool spam blocking software.

/^.*v.*i.*a.*g.*r.*a.*$/i

/cr[eéèêë][\+\-\*=<>\.\,;!\?%&§@\^°\$£€\{\}()\[\]\\\_01]dit/i

To block common spam phrases

The following phrases are some examples of common phrases found in spam messages.

/try it for free/i

/student loans/i

/you’re already approved/i

/special[\+\-\*=<>\.\,;!\?%&~#§@\^°\$£€\{\}()\[\]\\\_1]offer/i

FortiGate-100A Administration Guide 01-28007-0068-20041203 337