正则表达式：匹配特定单词的表达式

Question

我有一个正则表达式替换功能：

reg_replace(Input_Column,'\b(?:(?!https|www|http)\w)+\b', 'x')

输入 www.google.com，结果为 www.x.x，而应为 www.xxxxxx.xxx。

请帮我写一个按字母而不是按单词工作的正则表达式。

Answer 1

使用

\w(?!\w*\b(?<=\bhttps|\bwww|\bhttp))

见proof

说明

--------------------------------------------------------------------------------
  \w                       word characters (a-z, A-Z, 0-9, _)
--------------------------------------------------------------------------------
  (?!                      look ahead to see if there is not:
--------------------------------------------------------------------------------
    \w*                      word characters (a-z, A-Z, 0-9, _) (0 or
                             more times (matching the most amount
                             possible))
--------------------------------------------------------------------------------
    \b                       the boundary between a word char (\w)
                             and something that is not a word char
--------------------------------------------------------------------------------
    (?<=                     look behind to see if there is:
--------------------------------------------------------------------------------
      \b                       the boundary between a word char (\w)
                               and something that is not a word char
--------------------------------------------------------------------------------
      https                    'https'
--------------------------------------------------------------------------------
     |                        OR
--------------------------------------------------------------------------------
      \b                       the boundary between a word char (\w)
                               and something that is not a word char
--------------------------------------------------------------------------------
      www                      'www'
--------------------------------------------------------------------------------
     |                        OR
--------------------------------------------------------------------------------
      \b                       the boundary between a word char (\w)
                               and something that is not a word char
--------------------------------------------------------------------------------
      http                     'http'
--------------------------------------------------------------------------------
    )                        end of look-behind
--------------------------------------------------------------------------------
  )                        end of look-ahead

正则表达式：匹配特定单词的表达式

Regex : expression to match specific word

regex

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