在javascript中使用正则表达式检测表情符号 [英] Detecting emoticons with regex in javascript

问题描述

我正在创建一个用于检测表情符号的类，并使用以下内容来检测：）表情符号，包括各种变体（ =]，=）， [=，[：，等），但它不起作用，我不能为我的生活弄清楚出了什么问题。我正在JSFiddle中测试它。

I am creating a class to detect emoticons and have the following to detect :) smilies including their various variations (=], =), [=, [:, etc.), but it doesn't work and I can't for the life of me figure out what is wrong. I'm testing it in JSFiddle.

var DetectEmoticons = {
    countHappy: function(data) {
        var pattern = new RegExp("[:/=]-?[]/)] | [[/(]-?[:/=]", "g");
        var count = (data.match(pattern) || []).length;
        return count;
    }
}
alert(DetectEmoticons.countHappy("=)"));

推荐答案

[：=;] ？ - [）（| \\ / \] \ [] | [）（| \\ / \] \ [] - [：=;]

这看起来像是一个糟透人的混乱，直到你打破它：

This looks like an unholy mess from hell until you break it down:

[ ：=;] 匹配一个：或一个=或一个;

[:=;] matches one : or one = or one ;

[）（| \\ / \] \ [] 匹配一个），（，|，\（反斜杠，因为它是一个元字符），/，]（反斜杠，因为它是元字符）或[（反斜杠，因为它）是一个元字符。）（我们不需要反斜杠）或（因为它们不是字符类中的元字符）。

[)(|\\/\]\[] matches one ), (, |, \ (backslashed because it is a metacharacter), /, ] (backslashed because it is a metacharacter) or [ (backslashed because it is a metacharacter). (We didn't need to backslash ) or ( because they are not metacharacters inside of a character class).

| 在中心意味着'匹配我的左边或匹配我的权利'然后我写相同的两个字符类但反过来匹配方向相反的表情符号。

The | in the center means 'match left of me OR match right of me' and then I write the same two character classes but in reverse to match smileys that are reversed in direction.

我认为您的正则表达式的问题在于：

I think the problem with your regex is here:

[] /）]

你忘记了scape第一个] ，带有 \ ，因此它被视为提前结束字符类。

You forgot to escape the first ] with a \ so it is treated as ending the character class prematurely.

另一个问题是你认为正斜杠 / 用于逃避。不是， \ 用于转义， / 在正则表达式中没有特殊含义。

The other problem is that you thought forward slash / is used to escape. It's not, \ is used to escape, / has no special meaning in regex.

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