如何在javascript中拉出像twitter这样的字符串 [英] how to pull @ mentions out of strings like twitter in javascript

问题描述

我正在Node.js中编写一个应用程序，允许用户在Twitter上的消息中互相提及。我希望能够找到用户并向他们发送通知。为了做到这一点，我需要拉@usernames从node.js中的字符串中查找提及？

I am writing an application in Node.js that allows users to mention each other in messages like on twitter. I want to be able to find the user and send them a notification. In order to do this I need to pull @usernames to find mentions from a string in node.js?

任何建议，正则表达式，问题？

Any advice, regex, problems?

推荐答案

我发现这是在javascript中查找字符串内部提及的最佳方法。

I have found that this is the best way to find mentions inside of a string in javascript.

var str = "@jpotts18 what is up man? Are you hanging out with @kyle_clegg";
var pattern = /\B@[a-z0-9_-]+/gi;
str.match(pattern);
["@jpotts18", "@kyle_clegg"]

我故意将其限制为大写和小写字母数字和（ - ，_）符号，以避免可能混淆像（@ j.potts）这样的用户名的句点。

I have purposefully restricted it to upper and lowercase alpha numeric and (-,_) symbols in order to avoid periods that could be confused for usernames like (@j.potts).

这是什么< a href =https://github.com/twitter/twitter-text/blob/master/js/twitter-text.js#L91\"rel =noreferrer> twitter-text.js 正在落后场景。

This is what twitter-text.js is doing behind the scenes.

// Mention related regex collection
twttr.txt.regexen.validMentionPrecedingChars = /(?:^|[^a-zA-Z0-9_!#$%&*@＠]|RT:?)/;
twttr.txt.regexen.atSigns = /[@＠]/;
twttr.txt.regexen.validMentionOrList = regexSupplant(
    '(#{validMentionPrecedingChars})' +  // $1: Preceding character
    '(#{atSigns})' +                     // $2: At mark
    '([a-zA-Z0-9_]{1,20})' +             // $3: Screen name
    '(\/[a-zA-Z][a-zA-Z0-9_\-]{0,24})?'  // $4: List (optional)
  , 'g');
twttr.txt.regexen.endMentionMatch = regexSupplant(/^(?:#{atSigns}|[#{latinAccentChars}]|:\/\/)/);

如果你使用了更高效或更准确的东西，请告诉我。谢谢！

Please let me know if you have used anything that is more efficient, or accurate. Thanks!

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