用于“提及"的正则表达式 [英] regex for "mentions"

问题描述

我正在努力提出一个正则表达式，该正则表达式只能在单词的开头找到安培符号.例如:

I'm struggling to come up with a regex that would find the ampersat in the beginning of words only. For example:

在这里: @dog去了公园.

但不在这里: d @ og去了公园.

或者在这里: The @ dog去公园了.

本质上，我只想捕获正常的提及"行为，而忽略怪异的边缘情况.我觉得这很常见，因此必须有一些完善的正则表达式.

Essentially, I just want to capture normal "mention" behavior, while omitting weird edge cases. I feel that this is common enough that there must be some well-established regex for this.

我尝试过:

/(@\w+)/gi

但是，它捕获了我不希望获得的案例.

But, it captures cases that I do not wish to obtain.

推荐答案

您可以使用以下正则表达式:

You may use the following regex:

/\B@\w+/g

\ B 在非单词边界匹配，因此，它要求在 @ 之前的非单词(或字符串的开头).

\B matches at a non-word boundary, thus, it requires a non-word (or start of string) to be right before @.

请参见 regex演示

var re = /\B@\w+/g; 
var str = 'The @dog went to the park.\nBut not here: The d@og went to the park.\nOr here: The@dog went to the park.';
var res = str.match(re);
document.body.innerHTML = "<pre>" + JSON.stringify(res, 0, 4) + "</pre>";

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