dbdproulxcom michael hutchinson wrote body nice_girl_01 hello boredtired todaythis afternooneveningtonight forgive ignorance question mark colon start brackets boredtired rules boredtired affect outcome using avoids creating backreferences slightly faster backreference used boredtired boredtired without creating 1 1 reference spamassassin written perl uses pcre perl compatible regular expressions quite standard extended regular expressions full description see perlre man page man perlre pattern imsximsxpattern clustering capturing groups subexpressions like doesnt make backreferences fields splitbabcb like fields splitbabcb doesnt spit extra fields also cheaper capture characters dont need letters act flags modifiers imsximsx example simorethanmillioni equivalent verbose simorethanmillioni hth bob thu 07 aug 2008 022347 0700 nice girl like chat spam