如何让我的正则表达式排除负前瞻中指示的字符串？答案

【问题标题】：How do I get my regex to exclude the strings indicated in my negative lookahead?如何让我的正则表达式排除负前瞻中指示的字符串？
【发布时间】：2021-07-04 05:06:43
【问题描述】：

我的正则表达式匹配任何包含数字和字母的字符串，包括罗马数字。谁能帮我弄清楚如何排除我的否定前瞻中指示的字符串？我尝试切换到负后视并添加 \b 边界，这解决了这个问题，除了它不会包含全角字符，因为 \b 不包含它们。我很茫然。

(?:[０-９0-9]+[ⅠⅡⅢⅣⅥⅦⅧⅨⅪⅫⅤⅩⅬⅭⅮⅯA-zＡ-ｚ]+|[ⅠⅡⅢⅣⅥⅦⅧⅨⅪⅫⅤⅩⅬⅭⅮⅯA-zＡ-ｚ]+[０-９0-9]+)[ⅠⅡⅢⅣⅥⅦⅧⅨⅪⅫⅤⅩⅬⅭⅮⅯA-zＡ-ｚ０-９0-9]*(?!ｍｇ／ｋｇ|mg\/kg|ｎｍ|nm|MHz|ｐｐｍ|ppm|mmol|ｍｍｏｌ|g|ｇ|g|mL|ｍＬ|mol|ｍｏｌ|nM|ｎＭ|μL|v\/v)

https://regex101.com/r/u82LRb/12

【问题讨论】：

喜欢这个？ regex101.com/r/jqH77t/1
我认为你可以使用this regex。请通过评论提供反馈，让我们知道它是否有效，如果无效，您的期望是什么。

标签： regex

【解决方案1】：

使用

(?:[０-９0-9]+[ⅠⅡⅢⅣⅥⅦⅧⅨⅪⅫⅤⅩⅬⅭⅮⅯA-Za-zＡ-ｚ]+|[ⅠⅡⅢⅣⅥⅦⅧⅨⅪⅫⅤⅩⅬⅭⅮⅯA-Za-zＡ-ｚ]+[０-９0-9]+)[ⅠⅡⅢⅣⅥⅦⅧⅨⅪⅫⅤⅩⅬⅭⅮⅯA-Za-zＡ-ｚ０-９0-9]*(?!\p{L})(?<!ｍｇ(?=／ｋｇ)|mg(?=\/kg)|ｎｍ|nm|MHz|ｐｐｍ|ppm|mmol|ｍｍｏｌ|mL|ｍＬ|mol|ｍｏｌ|nM|ｎＭ|μL|v(?=\/v)|[gｇ])

见regex proof。

解释

--------------------------------------------------------------------------------
  (?:                      group, but do not capture:
--------------------------------------------------------------------------------
    [０-９0-9]+           any character of: '0' to '9' (1 or more times 
                           (matching the most  amount possible))
--------------------------------------------------------------------------------
    [ⅠⅡⅢⅣⅥⅦⅧⅨⅪⅫⅤⅩⅬⅭⅮⅯ       any Roman number or 'A' to 'Z', 'a' to 'z'
     A-Za-zＡ-ｚ]+                   or 'Ａ' to 'ｚ'
--------------------------------------------------------------------------------
   |                        OR
--------------------------------------------------------------------------------
    [ⅠⅡⅢⅣⅥⅦⅧⅨⅪⅫⅤⅩⅬⅭⅮⅯ       any Roman number or 'A' to 'Z', 'a' to 'z'
     A-Za-zＡ-ｚ]+                   or 'Ａ' to 'ｚ'
--------------------------------------------------------------------------------
    [０-９0-9]+              any character of: '0' to '9'
                             (1 or more times (matching the most amount possible))
--------------------------------------------------------------------------------
  )                        end of grouping
--------------------------------------------------------------------------------
  [ⅠⅡⅢⅣⅥⅦⅧⅨⅪⅫⅤ       any Roman number, or 'A' to 'Z', 'a' to 'z'
  ⅩⅬⅭⅮⅯA-Za-z             or 'Ａ' to 'ｚ'
  Ａ-ｚ０-９0-9]*          
--------------------------------------------------------------------------------
  (?!                      look ahead to see if there is not:
--------------------------------------------------------------------------------
    \p{L}                    any Unicode letter character 
--------------------------------------------------------------------------------
  )                        end of look-ahead
--------------------------------------------------------------------------------
  (?<!                     look behind to see if there is not:
--------------------------------------------------------------------------------
    ｍｇ                    'ｍｇ'
--------------------------------------------------------------------------------
    (?=                      look ahead to see if there is:
--------------------------------------------------------------------------------
      ／ｋｇ                      '／ｋｇ'
--------------------------------------------------------------------------------
    )                        end of look-ahead
--------------------------------------------------------------------------------
   |                        OR
--------------------------------------------------------------------------------
    mg                       'mg'
--------------------------------------------------------------------------------
    (?=                      look ahead to see if there is:
--------------------------------------------------------------------------------
      \/kg                       '/kg'
--------------------------------------------------------------------------------
    )                        end of look-ahead
--------------------------------------------------------------------------------
   |                        OR
--------------------------------------------------------------------------------
   ｎｍ                     'ｎｍ'
--------------------------------------------------------------------------------
   |                        OR
--------------------------------------------------------------------------------
    nm                       'nm'
--------------------------------------------------------------------------------
   |                        OR
--------------------------------------------------------------------------------
    MHz                      'MHz'
--------------------------------------------------------------------------------
   |                        OR
--------------------------------------------------------------------------------
    ｐｐｍ                  'ｐｐｍ'
--------------------------------------------------------------------------------
   |                        OR
--------------------------------------------------------------------------------
    ppm                      'ppm'
--------------------------------------------------------------------------------
   |                        OR
--------------------------------------------------------------------------------
    mmol                     'mmol'
--------------------------------------------------------------------------------
   |                        OR
--------------------------------------------------------------------------------
    ｍｍｏｌ                'ｍｍｏｌ'
--------------------------------------------------------------------------------
   |                        OR
--------------------------------------------------------------------------------
    mL                       'mL'
--------------------------------------------------------------------------------
   |                        OR
--------------------------------------------------------------------------------
    ｍＬ                  'ｍＬ'
--------------------------------------------------------------------------------
   |                        OR
--------------------------------------------------------------------------------
    mol                      'mol'
--------------------------------------------------------------------------------
   |                        OR
--------------------------------------------------------------------------------
    ｍｏｌ                  'ｍｏｌ'
--------------------------------------------------------------------------------
   |                        OR
--------------------------------------------------------------------------------
    nM                       'nM'
--------------------------------------------------------------------------------
   |                        OR
--------------------------------------------------------------------------------
   ｎＭ                      'ｎＭ'
--------------------------------------------------------------------------------
   |                        OR
--------------------------------------------------------------------------------
    μL                  'μL'
--------------------------------------------------------------------------------
   |                        OR
--------------------------------------------------------------------------------
    v                        'v'
--------------------------------------------------------------------------------
    (?=                      look ahead to see if there is:
--------------------------------------------------------------------------------
      \/v                        '/v'
--------------------------------------------------------------------------------
    )                        end of look-ahead
--------------------------------------------------------------------------------
   |                        OR
--------------------------------------------------------------------------------
    [gｇ]                   any character of: 'g' or 'ｇ'
--------------------------------------------------------------------------------
  )                        end of look-behind

【讨论】：