Fortinet fortigate-200a Betriebsanweisung

/block|any|word/
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

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.