Grepdiff 没有正确匹配行的开头或结尾

Question

我对 grepdiff 中的某些行为感到困惑。我正在尝试编写一个脚本来解析 diff 的各个块并寻找模式。特别是，我正在寻找添加和删除仅对数值进行微小更改的行的差异，如下所示：

@@ -2160 +2160 @@
-        "posZ": 13.912,
+        "posZ": 13.911,

我的目标是让脚本还原这些更改。为此，我需要先检测它们。但是，我无法让 grepdiff 正确识别行。

这个正则表达式匹配：

git diff -U0 HEAD^ | grepdiff -E '^[^0-9-]*[0-9-]+.[0-9]+,' --output-matching=hunk

这不是：

git diff -U0 HEAD^ | grepdiff -E '^[^0-9-]*[0-9-]+.[0-9]+,$' --output-matching=hunk

同样，这也不是：

git diff -U0 HEAD^ | grepdiff -E '^\+[^0-9-]*[0-9-]+.[0-9]+,' --output-matching=hunk

如果不正确匹配行的开头或结尾，我不知道如何识别这些帅哥。

Answer 1

使用

grepdiff -E '^[^0-9-]*[0-9-]+[.][0-9]+,[[:space:]]*$'

说明

--------------------------------------------------------------------------------
  ^                        the beginning of the string
--------------------------------------------------------------------------------
  [^0-9-]*                 any character except: '0' to '9', '-' (0
                           or more times (matching the most amount
                           possible))
--------------------------------------------------------------------------------
  [0-9-]+                  any character of: '0' to '9', '-' (1 or
                           more times (matching the most amount
                           possible))
--------------------------------------------------------------------------------
  [.]                      any character of: '.'
--------------------------------------------------------------------------------
  [0-9]+                   any character of: '0' to '9' (1 or more
                           times (matching the most amount possible))
--------------------------------------------------------------------------------
  ,                        ','
--------------------------------------------------------------------------------
  [[:space:]]*             any character of: whitespace characters
                           (like \s) (0 or more times (matching the
                           most amount possible))
--------------------------------------------------------------------------------
  $                        before an optional \n, and the end of the
                           string

Grepdiff 没有正确匹配行的开头或结尾

Grepdiff not matching beginning or end of lines properly

regex

diff

git-diff