in Burp Suite

Open Burp Suite, go to the Intruder tab, and the Options sub-tab

Look for the section "grep"

Click "clear" to clear the existing listings in the list box

Click "load" and load regex/errors.txt from your fuzzdb path, as below

This will search all output pages generated by Intruder payloads for the extensive list of known error strings, for later analysis.

View the contents of regex/errors.txt: http://code.google.com/p/fuzzdb/source/browse/trunk/regex/errors.txt

Burp Suite free edition available from: http://portswigger.net/suite/download.html