正则表达式匹配Javascript中的回车 [英] Regex to match carriage return in Javascript

问题描述

我正在尝试编写一些Javascript来隐藏一些仅包含回车符的元素。我理解解决这个问题的正确方法是停止创建这些元素，但不幸的是，在这种情况下这是不可能的。我正在尝试使用正则表达式来搜索不需要的元素但是没有太多运气。我写的函数如下：

I am trying to write some Javascript to hide some elements that contain only carriage returns. I appreciate that the correct way to solve this problem would be to stop these elements being created, but unfortunately that is not possible in this instance. I am trying to user a regular expression to search for the unwanted elements but am not having much luck. The function I have written is as follows:

function HideEmptyP()
{

    var patt = (\\r)
    for(var i = 0;i<desc[i].length;i++);
    {
    var desc[i] = document.getElementsByClassName('sitspagedesc');
    var result[i] = patt.test(desc[i]);
        if (result[i] == true)
            {
            desc[i].style.display='none';
            }
        else
            {
            alert("No Match!");
            }
    }

我在Web控制台中收到的错误是'语法错误：非法字符'。

The error I'm getting in the Web Console is 'Syntax Error: Illegal Character'.

感谢有关如何解决此问题的任何想法。

Grateful for any ideas on how to solve this.

提前致谢。

推荐答案

我正在尝试编写一些Javascript来隐藏一些只包含回车的元素。

I am trying to write some Javascript to hide some elements that contain only carriage returns.

不需要正则表达式，只需将元素的 innerHTML 属性与<$ c $进行比较c>\\\\，例如：

There's no need for a regular expression for that, just compare the element's innerHTML property to "\\r", e.g.:

if (demo[i].innerHTML === "\\r") {
    // Remove it
}

但请注意，某些浏览器可能会转换单个回车符。您可能想要检查\\\\，\\ n，并且只是空间。要做到这一点，你可能想要使用正则表达式。

But beware that some browsers may transform a single carriage return. You might want to check for "\\r", "\\n", and just a space. To do that, you might want to use a regular expression.

你的正则表达式文字（（\\\ \\ r））完全无效，值得阅读它们了解正确的语法。要在JavaScript中编写正则表达式文字，可以使用 / 作为分隔符。所以： / \\r / 。要测试字符串是否仅包含 \ r ， \ n 或空格，您可以使用 / ^ [\\\ n] + $ / （要求至少有一个匹配的字符，并使用 ^ 表示字符串开头， $ 表示字符串结束）：

Your regular expression literal ((\\r)) is just completely invalid, it's worth reading up on them to learn the correct syntax. To write a regular expression literal in JavaScript, you use / as the delimiter. So: /\\r/. To test that a string contains only \r, \n, or space, you can use /^[\r\n ]+$/ (which requires there be at least one character that matches, and uses ^ to indicate start-of-string, and $ to indicate end-of-string):

if (demo[i].innerHTML.match(/^[\r\n ]+$/) {
    // Remove it
}

这篇关于正则表达式匹配Javascript中的回车的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！