如何判断字符串是否包含HTML实体（如& amp;）？ [英] How to tell if a string contains HTML entity (like &)?

问题描述

我正在尝试编写一个函数来检查一个特殊HTML实体数组的参数（比如用户输入'& amp'而不是'&'），然后在这些输入的实体周围添加一个范围。

I'm trying to write a function that checks a parameter against an array of special HTML entities (like the user entered '&amp' instead of '&'), and then add a span around those entered entities.

如何搜索字符串参数才能找到它？它是一个正则表达式吗？

How would I search through the string parameter to find this? Would it be a regex?

这是我到目前为止的代码：

This is my code thus far:

 function ampersandKiller(input) {
 var specialCharacters = ['&', ' ']
 if($(specialCharacters).contains('&')) {
     alert('hey')
 } else {
     alert('nay')
 }
}

显然这不起作用。有没有人有任何想法？

Obviously this doesn't work. Does anyone have any ideas?

因此，如果传递了像我的名字这样的字符串& amp; ，那么将呈现我的名字是< span>& amp;< / span> 。如果一个特殊字符被列出两次 - 比如'我真的喜欢& amp;& amp;& amp; 它只会渲染每个元素的范围。用户还必须能够使用普通的& 。

So if a string like My name is & was passed, it would render My name is <span>&amp;</span>. If a special character was listed twice -- like 'I really like &&& it would just render the span around each element. The user must also be able to use the plain &.

推荐答案

您可以使用此正则表达式查找和包装实体：

You could use this regular expression to find and wrap the entities:

input.replace(/&amp;|&nbsp;/g, '<span>$&</span>')

任何类型的实体，您也可以使用它：

For any kind of entity, you could use this too:

input.replace(/&(?:[a-z]+|#\d+);/g, '<span>$&</span>');

它匹配word实体以及数字实体。例如：

It matches the "word" entities as well as numeric entities. For example:

'test & &amp; &#60;'.replace(/&(?:[a-z]+|#x?\d+);/gi, '<span>$&</span>');

输出：

test & <span>&amp;</span> <span>&#60;</span>

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