File names indicate the type of essays: "portfolio" indicates essays written over the course of the semester; "term" indicates term papers; "draft" and "final" indicate first and final drafts respectively.
You may use any PERL regular expression as a search string. Your string is searched within word boundaries. So, for example, to do a truncated search for words beginning with "feel", just add the symbol for the word character class (\w) and the desired number of occurences: feel\w* will match any word, while feel\w? will match "feel" and "feels", but not "feeler" or "feeling" \w = word character \d = digit character \s = whitespace incl. newline * = any, + = one or more, ? = zero or one occurences