是否存在类似于Vim正则表达式的单词原子的开头和结尾的JavaScript等同于“\<"和“\>”？ [英] Are there JavaScript equivalents of the Vim regular expression start and end of word atoms "\<" and "\>"?
问题描述
我知道大多数正则表达式引擎，包括JavaScript中的一个，有 \b 来匹配单词边界，无论是在单词的开头还是结尾。
I know most regular expression engines, including the one in JavaScript have \b to match a word boundary, be it at either the start or end of a word.
但是Vim还有两个更具体的正则表达式原子：
But Vim also has two more specific regular expression atoms:
\<matches only the word boundary at the start of a word\>matches only the word boundary at the end of a word
JavaScript是否具有这些原子的等价物，如果没有，是否有办法以其他方式表达更精确的语义？
Does JavaScript have an equivalent to these atoms, and if not is there a way to express their more precise semantics some other way?
推荐答案
据我所知，没有任何预定义。但你可以做的是，在字边界添加一个 lookahead ，检查是否它是单词的开头或结尾。
As far as I know there is nothing predefined. But what you can do is, to add a lookahead to the word boundary, to check if it is the start or the end of the word.
\< 然后 \b（？= \w）。这将检查单词边界后面是否有单词字符==>单词的开头。 在regexr上查看此示例
\< would be then \b(?=\w). This checks if after the word boundary a word character is following ==> start of the word. See this as example on regexr
\> 然后是 \ b（？！\ w）。这将检查单词边界后面是否有单词字符==>单词结尾
\> would be then \b(?!\w). This checks if after the word boundary not a word character is following ==> end of the word
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