重新研究多種模式

Question

我正在逐行解析腳本以找到以下模式“print（“xxxx”）或“LOG.info（“xxxx”）。

1. 當執行下面的模式時，它匹配所有以 print SeacrhOutput = re.search(r'print\(((.*?)\))',line)
2. 但是，觀察到以下錯誤 - sre_constants.error: bad escape \L at position 5當 LOG.info 添加到模式re.search(r'print\|LOG.info\(((.*?)\))',line)

Answer 1

利用

(?:print|LOG\.info)\((.*?)\)

見證明。 該表達式將匹配print或LOG.info與(在它們之后，然后將任何零個或多個字符捕獲到最左邊的組中) 。

解釋：

NODE                     EXPLANATION
--------------------------------------------------------------------------------
  (?:                      group, but do not capture:
--------------------------------------------------------------------------------
    print                    'print'
--------------------------------------------------------------------------------
   |                        OR
--------------------------------------------------------------------------------
    LOG                      'LOG'
--------------------------------------------------------------------------------
    \.                       '.'
--------------------------------------------------------------------------------
    info                     'info'
--------------------------------------------------------------------------------
  )                        end of grouping
--------------------------------------------------------------------------------
  \(                       '('
--------------------------------------------------------------------------------
  (                        group and capture to \1:
--------------------------------------------------------------------------------
    .*?                      any character except \n (0 or more times
                             (matching the least amount possible))
--------------------------------------------------------------------------------
  )                        end of \1
--------------------------------------------------------------------------------
  \)                       ')'