Custom rules - which chars to escape?

["C.M. Burns" <mo...@googlemail.com>]

Hi list,

when creating acustom rule, what characters have to be escaped?

For example this scustom rule
http://www.novell.com/communities/node/4630/whitelisting-ip-address-spamassassin
escapes both [ and ] while in common regex on only [ must be escaped
http://www.regular-expressions.info/characters.html


by
SK