用于检测cuits - Python的Regex

Question

我需要找到一个正则表达式，它允许我识别以下序列。两个数字空间，8个数字空间，一个数字空间。数字之间可以出现多个字符组合。

\d{2}.?\d{8}.?\d{1}

应匹配：

11 11111111 1
11-11111111-1
11.11111111.1
11|11111111|1
11.11111111  1
11  11111111  1

不应该匹配：

11  11111111  11
1  11111111  11

Answer 1

使用

(?<!\d)\d{2}\D*\d{8}\D*\d(?!\d)

见证明。

解释

--------------------------------------------------------------------------------
  (?<!                     look behind to see if there is not:
--------------------------------------------------------------------------------
    \d                       digits (0-9)
--------------------------------------------------------------------------------
  )                        end of look-behind
--------------------------------------------------------------------------------
  \d{2}                    digits (0-9) (2 times)
--------------------------------------------------------------------------------
  \D*                      non-digits (all but 0-9) (0 or more times
                           (matching the most amount possible))
--------------------------------------------------------------------------------
  \d{8}                    digits (0-9) (8 times)
--------------------------------------------------------------------------------
  \D*                      non-digits (all but 0-9) (0 or more times
                           (matching the most amount possible))
--------------------------------------------------------------------------------
  \d                       digits (0-9)
--------------------------------------------------------------------------------
  (?!                      look ahead to see if there is not:
--------------------------------------------------------------------------------
    \d                       digits (0-9)
--------------------------------------------------------------------------------
  )                        end of look-ahead