Right now that functionality isn't present - when I had it before it was running the cpu to some insane levels as some people (the few who did use the regexp functionality) had some regexps that were pretty large and heavy on the database.
Since I assume 90%+ just use simple item search, I added the WTB/WTS drop down select list and changed to a simple search in the recent rewrite.
Next time I have the auc tracker itch that I need to scratch, I'll see about adding something for multi item queries (although I'll probably just keep it to something simpler than regexp like comma separated names).
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