嘗試使用MacOS的sed洗掉字串中的重復單詞-有解無憂

我正在嘗試使用以下命令從 MacOS 使用 sed 洗掉字串中的重復單詞：

sed -r 's/^([A-Za-z0-9_] ) \1$/\1/' <<< 'The best of of The United Kingdom'

但它只會回傳

The best of of United Kingdom

我缺少什么？你們可以把手給我嗎？請。

uj5u.com熱心網友回復：

你可以試試這個 sed

$ sed 's/\([^ ]* \)\1\ /\1/' input_file
The best of The United Kingdom

您的原始代碼有不需要的錨點^|$。這是一個固定版本

$ sed -r 's/([A-Za-z0-9_]* )\1 /\1/' <<< 'The best of of The United Kingdom'
The best of The United Kingdom

uj5u.com熱心網友回復：

我安裝了 gnu-sed。問題解決了。

uj5u.com熱心網友回復：

您不必要地在行首和行尾錨定正則運算式。洗掉^和$。更改-r為 POSIX -E，它將在 BSD/Mac sed 上運行。您還需要該g標志來替換多個重復的單詞模式。

sed -E 's/([A-Za-z0-9_] ) \1/\1/g'

uj5u.com熱心網友回復：

利用

sed -E 's/[[:<:]]([[:alnum:]_] )([[:space:]] \1) [[:>:]]/\1/'

解釋

--------------------------------------------------------------------------------
  [[:<:]]                  the boundary between a non-word char or
                           start of string and a word char
--------------------------------------------------------------------------------
  (                        group and capture to \1:
--------------------------------------------------------------------------------
    [[:alnum:]_]             any character of: letters and digits,
                             '_' (1 or more times (matching the most
                             amount possible))
--------------------------------------------------------------------------------
  )                        end of \1
--------------------------------------------------------------------------------
  (                        group and capture to \2 (1 or more times
                           (matching the most amount possible)):
--------------------------------------------------------------------------------
    [[:space:]]              any character of: whitespace characters
                             (like \s) (1 or more times (matching the
                             most amount possible))
--------------------------------------------------------------------------------
    \1                       what was matched by capture \1
--------------------------------------------------------------------------------
  )                        end of \2
--------------------------------------------------------------------------------
  [[:>:]]                  the boundary between a word char (\w) and
                           something that is not a word char

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標籤：苹果系统 sed bsd

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