regex - 查找搜索项加上前后 4 行

Question

我正在使用 notepad++ 并且希望找到特定字符串出现的上下文。

所以搜索字符串是0wh.*0subj，我想找到这个搜索项以及它前后的 4 行。

eg: xxx means whatever is on a new line. the search result should be:
xxx
xxx
xxx
xxx
0wh.*0subj
xxx
xxx
xxx
xxx

我已经尝试使用\n\r 但它不起作用。任何提供的帮助将不胜感激。

问候

Answer 1

这将在 Notepad++ 中工作(已测试):

(?m)(^[^\r\n]*\R+){4}0wh\.\*0subj[^\r\n]*\R+(^[^\r\n]*\R+){4}

在屏幕截图中，请注意 555 行未被选中。这只是当前行。

解释正则表达式

(?m)                     # set flags for this block (with ^ and $
                         # matching start and end of line) (case-
                         # sensitive) (with . not matching \n)
                         # (matching whitespace and # normally)
(                        # group and capture to \1 (4 times):
  ^                      #   the beginning of a "line"
  [^\r\n]*               #   any character except: '\r' (carriage
                         #   return), '\n' (newline) (0 or more times
                         #   (matching the most amount possible))
  \R+                    #   'R' (1 or more times (matching the most
                         #   amount possible))
){4}                     # end of \1 (NOTE: because you are using a
                         # quantifier on this capture, only the LAST
                         # repetition of the captured pattern will be
                         # stored in \1)
0wh                      # '0wh'
\.                       # '.'
\*                       # '*'
0subj                    # '0subj'
[^\r\n]*                 # any character except: '\r' (carriage
                         # return), '\n' (newline) (0 or more times
                         # (matching the most amount possible))
\R+                      # 'R' (1 or more times (matching the most
                         # amount possible))
(                        # group and capture to \2 (4 times):
  ^                      #   the beginning of a "line"
  [^\r\n]*               #   any character except: '\r' (carriage
                         #   return), '\n' (newline) (0 or more times
                         #   (matching the most amount possible))
  \R+                    #   'R' (1 or more times (matching the most
                         #   amount possible))
){4}                     # end of \2 (NOTE: because you are using a
                         # quantifier on this capture, only the LAST
                         # repetition of the captured pattern will be
                         # stored in \2)