I have a word list, such as:


I want to remove letter and tagggs from it (because they have two or more of the same letters in a row). Maybe this can be done using sed?


You can use one of the regex tools that supports backreferences e.g.

sed '/\(.\)\1/d' file

grep -v '\(.\)\1' file

Change . to [[:alpha:]] if you really want to restrict it to repeated letters rather than any repeated characters.

  • that's removing lines, not words. but it works for that input format – Jasen May 25 at 3:51

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