Using the blacklist available at
http://blacklist.chongqed.org/ and putting the entry in wordblock.conf causes an error to happen when creating or editing a page. I believe DokuWiki can't handle the long list of expressions. The error states:
Warning: Compilation failed: regular expression too large at offset 0 in /home/.nary/wikipes/wikipes.com/inc/common.php on line 303
Warning: Cannot modify header information - headers already sent by (output started at /home/.nary/wikipes/wikipes.com/inc/common.php:303) in /home/.nary/wikipes/wikipes.com/doku.php on line 76