javascript - 如何修改正则表达式

Question

我有一段文本如下，文本中包含一些单词及其含义。我需要使用 Javascript 正则表达式方法获取这些单词。例如，如果我在下面给出文本，那么返回的单词应该是 Necessity、Lay of the land 和 Mumble。

Necessity:(noun)the need for something, or something that is needed Example: In my work, a computer is a necessity.

Lay of the land: (idiom n. Or v.)the general state or condition of affairs under consideration; the facts of a situation Example: We asked a few questions to get the lay of the land

Mumble:(verb) to speak quietly or in an unclear way so that the words are difficult to understand Example: She mumbled something about needing to be home, then left.

我的编码如下，但它没有按预期工作。

let text = `Necessity:(noun)the need for something, or something that is needed
Example: In my work, a computer is a necessity.

Lay of the land: (idiom n. Or v.)the general state or condition of affairs under consideration; the facts of a situation
Example: We asked a few questions to get the lay of the land.

Mumble:(verb) to speak quietly or in an unclear way so that the words are difficult to understand
Example: She mumbled something about needing to be home, then left.
`;

let matches = text.match(/[A-Za-z]+(?=\:\S)/g);

console.log(matches); //['Necessity', 'Mumble']

我可以知道我错过了什么吗？任何帮助将不胜感激。

Answer 1

你可以使用这个正则表达式:

/^[A-Za-z]+(?:\s+[A-Za-z]+)*(?=:)/gm

RegEx Demo

正则表达式分解:

• ^:开始
• [A-Za-z]+:匹配1+个英文字母
• (?:\s+[A-Za-z]+)*:匹配1+个空格后跟1+个英文字母。重复此组 0 次或更多次。
• (?=:):先行断言我们在下一个位置有 :