让正则表达式查找缺失的词

Question

在此示例中，我需要查找以 @ 开头且在下一个 @ 之前没有单词“关键字”的条目：

@something
something
something
keyword
something
something

@something
something
something
something
something

@something
something
something
keyword
something
something

所以这个搜索字符串会指向第二个例子。有人知道如何使用 Regex 执行此操作吗？

Answer 1

以下正则表达式似乎有效：

@\w+(?![^@]*\bkeyword\b[^@]*)

Demo

解释：

@\w+             match a @label
(?!              provided that we DON'T see ahead
    [^@]*        any text without another @label
    \bkeyword\b  which also has the "keyword"
)

让正则表达式查找缺失的词

Have Regex Find Absent Word

regex

missing-symbols

Demo