正则表达式重复模式

Question

我尝试使用正则表达式从下面的日志中捕获数据组。模式是

<item> : <key> = <value> , <key> = <value>, ..., <key> = <value>

([#\w\d]*?)[\s]*=[\s]*([.\w\d]*)可以捕获论坛<key>和论坛<value> 但我也希望捕获<item>组，因此我将上述组合并重复使用{n}。

([\w]*):([\s]*(([#\w\d]*?)[\s]*=[\s]*([.\w\d]*)),*){1,}

  

20141207,07：15：52,0，＆gt;＆gt;比例：casher＃= 30，   值= 2.579，单位=比率，误差= N 20141207,07：15：52,0，＆gt;＆gt;比率：   casher＃= 31，Value = 4.509，Units = ratio，Error = N.   20141207,07：15：52,0，＆gt;＆gt; RATIO：casher＃= 32，   值= 3.735，单位=比率，误差= N 20141207,07：15：52,0，＆gt;＆gt;比率：   casher＃= 33，Value = 2.401，Units = ratio，Error = N

     

20141207,07：15：52,0，＆gt;＆gt; CUSTOMER：casher＃= 30，Value = 50，Units = count   20141207,07：15：52,0，＆gt;＆gt; CUSTOMER：casher＃= 31，Value = 6，Units = count   20141207,07：15：52,0，＆gt;＆gt; CUSTOMER：casher＃= 32，Value = 88，Units = count   20141207,07：15：52,0，＆gt;＆gt; CUSTOMER：casher＃= 33，Value = 33，Units = count

显然结果不是预期的结果。任何人都可以给我一些提示吗？我最终使用python转换为代码。谢谢。

Answer 1

(?<=>>)(\w+):|([\w#]+)\s*=\s*(\S+?)(?:,|\s)

试试这个。抓住捕获。参见演示。

https://regex101.com/r/fA6wE2/1

NODE                     EXPLANATION
--------------------------------------------------------------------------------
  (?<=                     look behind to see if there is:
--------------------------------------------------------------------------------
    >>                       '>>'
--------------------------------------------------------------------------------
  )                        end of look-behind
--------------------------------------------------------------------------------
  (                        group and capture to \1:
--------------------------------------------------------------------------------
    \w+                      word characters (a-z, A-Z, 0-9, _) (1 or
                         more times (matching the most amount
                         possible))
--------------------------------------------------------------------------------
   )                        end of \1
--------------------------------------------------------------------------------
  :                        ':'
--------------------------------------------------------------------------------
  |                        OR
 --------------------------------------------------------------------------------
  (                        group and capture to \2:
--------------------------------------------------------------------------------
    [\w#]+                   any character of: word characters (a-z,
                         A-Z, 0-9, _), '#' (1 or more times
                         (matching the most amount possible))
--------------------------------------------------------------------------------
  )                        end of \2
--------------------------------------------------------------------------------
  \s*                      whitespace (\n, \r, \t, \f, and " ") (0 or
                       more times (matching the most amount
                       possible))
--------------------------------------------------------------------------------
  =                        '='
--------------------------------------------------------------------------------
  \s*                      whitespace (\n, \r, \t, \f, and " ") (0 or
                       more times (matching the most amount
                       possible))
--------------------------------------------------------------------------------
  (                        group and capture to \3:
--------------------------------------------------------------------------------
    \S+?                     non-whitespace (all but \n, \r, \t, \f,
                         and " ") (1 or more times (matching the
                         least amount possible))
--------------------------------------------------------------------------------
  )                         end of \3
--------------------------------------------------------------------------------
  (?:                      group, but do not capture:
--------------------------------------------------------------------------------
    ,                        ','
--------------------------------------------------------------------------------
   |                        OR
--------------------------------------------------------------------------------
    \s                       whitespace (\n, \r, \t, \f, and " ")
--------------------------------------------------------------------------------
  )                        end of grouping

Answer 2

您的文件是csv文件，因此您可以让您的生活更轻松并使用csv模块：

import csv

f = open('data.txt', 'rb')

for row in csv.reader(f, delimiter=','):
    if row:
        item, key_and_val = row[3].split(':')
        item = item[2:]
        key, val = key_and_val.split('=')

        print item
        print '    {} => {}'.format(key.strip(), val.strip())

        for key_and_val in row[4:]:
            key, val = key_and_val.split('=')
            print '    {} => {}'.format(key.strip(), val.strip())

--output:--
RATIO
    casher# => 30
    Value => 2.579
    Units => ratio
    Error => N
RATIO
    casher# => 31
    Value => 4.509
    Units => ratio
    Error => N
RATIO
    casher# => 32
    Value => 3.735
    Units => ratio
    Error => N
RATIO
    casher# => 33
    Value => 2.401
    Units => ratio
    Error => N
CUSTOMER
    casher# => 30
    Value => 50
    Units => count
CUSTOMER
    casher# => 31
    Value => 6
    Units => count
CUSTOMER
    casher# => 32
    Value => 88
    Units => count
CUSTOMER
    casher# => 33
    Value => 33
    Units => count

  

你的匹配模式也匹配key = value，即使＆＃34;项目：＆＃34;不   存在，排除那些键=值行的任何先进技术？

以下内容将跳过没有项目的行：

for row in csv.reader(f, delimiter=','):
    if row:
        if row[3].startswith('>>'):  #Check if there is an item
            item, key_and_val = row[3].split(': ')
            item = item[2:]
            key, val = key_and_val.split('=')
            print item
            print '    {} => {}'.format(key.strip(), val.strip())

            for key_and_val in row[4:]:
                key, val = key_and_val.split('=')
                print '    {} => {}'.format(key.strip(), val.strip())

f.close()