正则表达式 - 在javascript中用单个替换多个换行符 [英] regex - replace multi line breaks with single in javascript

问题描述

这是javascript中的某种变量内容：

this is some kind of variable content in javascript:

    <meta charset="utf-8">

    <title>Some Meep meta, awesome</title>




    <-- some comment here -->
    <meta name="someMeta, yay" content="meep">

</head>

我希望将多行换行符（未知数字）减少到单个换行符，而剩下的格式仍然保持不变。这应该在 javascript 中使用 regex 完成。

I want to reduce the multi line breaks (unknown number) to a single line break while the rest of the formatting is still maintained. This should be done in javascript with a regex.

我有制表机问题或保留格式。

I have problems with the tabulator or to keep the format.

推荐答案

试试这个：

text.replace(/\n\s*\n/g, '\n');

这基本上会查找两个换行符，其间只有空格。然后它通过单个换行符取代它们。由于全局标志 g ，每次可能的匹配都会重复此操作。

This basically looks for two line breaks with only whitespace in between. And then it replaces those by a single line break. Due to the global flag g, this is repeated for every possible match.

是否可以留下双线换行而不是单个

is it possibile to leave a double line break instead of a single

当然，最简单的方法是只查找三个换行符并将其替换为两个：

Sure, simplest way would be to just look for three line breaks and replace them by two:

text.replace(/\n\s*\n\s*\n/g, '\n\n');

如果你想在其中一行上保留空白（无论出于何种原因），你也可以这样做：

If you want to maintain the whitespace on one of the lines (for whatever reason), you could also do it like this:

text.replace(/(\n\s*?\n)\s*\n/, '$1');

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