正则表达式/ grep匹配：“不是这个”和“那个”

Question

在Linux命令行中，我想在多个文件中查找所有实例，其中我没有使用Fig.引用图形引用。

所以当我没有准确\ref{fig为Fig. 作序言时，我正在寻找每一行。

1. Fig. \ref{fig:myFigure}
2. A sentence with Fig. \ref{fig:myFigure} there.
3. \ref{fig:myFigure}
4. A sentence with \ref{fig:myFigure} there.

正则表达式应该忽略案例（1）和（2），但是找到案例（3）和（4）。

Answer 1

您可以使用Negative Lookahead，如：

^((?!Fig\. {0,1}\\ref\{fig).)*$

https://regex101.com/r/wSw9iI/2

Negative Lookahead (?!Fig\.\s*\\ref\{fig)
Assert that the Regex below does not match
Fig matches the characters Fig literally (case sensitive)
\. matches the character . literally (case sensitive)
\s* matches any whitespace character (equal to [\r\n\t\f\v ])
* Quantifier — Matches between zero and unlimited times, as many times as possible, giving back as needed (greedy)
\\ matches the character \ literally (case sensitive)
ref matches the characters ref literally (case sensitive)
\{ matches the character { literally (case sensitive)
fig matches the characters fig literally (case sensitive)