To search for duplicate words in a manuscript (such as “the the”) in Vim, look for this pattern. (Erratum 2009-10-13: changed \+ to * to find “or or”.)

\m\c\<\\\@<!\([a-z]\%(['a-z]*[a-z]\)\?\)\_W\+\\\@<!\1\>

用 Vim 搜尋上列樣式，可以抓到文稿裡諸如 “the the” 一類的重複詞。 (2009-10-13 勘誤：把 \+ 改為 * 才能找到 “or or”。)