Google Message Security for Google Apps Administration Gu Bedienungsanleitung PDF herunterladen (Seite 235)

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Content Manager 235

Use Multiple Regular Expressions for a Filter

You can enter up to three regular expressions for a filter—one expression per filter

rule. You might want to enter multiple regular expressions for the following

reasons:

• To avoid the regex complexity or word list limitation

If you your regular expression exceeds the component (complexity) limitation

for a rule, you can enter two or three shorter expressions. For example, if your

expression for a word list contains more than 48 words, you can enter two or

three shorter lists, for a total of up to 144 words.

For details about components in regular expressions, see “Content Manager

Support for Regular Expressions” on page 224.

• To increase the filter’s effectiveness

Often, you can increase the number of patterns a filter matches by creating

multiple regular expressions. For example, to match obfuscations for the word

viagra, you can create up to three different regular expressions for the filter,

each of which matches different types of obfuscations, as shown in the

following table:

This regular expression...

Matches these types of

obfuscations...

v[i!1][a@][g9]r[a@]

• vi@gra

• v1agra

• v1@gra

• via9ra

v[\W_]{1,3}i[\W_]{1,3}a[\W_]{1,3}g[\W_]{1

,3}r[\W_]{1,3}a{1,3}

• v**i**a**g**r**a

• v_i_a_g_r_a

• v~i~a~g~r~a

• v/i/a/g/r/a

• v i a g r a

\\/v{1,5}i{1,5}a{1,5}g{1,5}r{0,5}a{0,5}

• \/iagra

• \/iiaaggrraa

• vviiiaaaggrrraaa

• viag

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