正则表达式 - 在 javascript 中用单行替换多换行符 [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>

我想将多换行符(未知数)减少为单个换行符，同时保留其余格式.这应该在带有 regex 的 javascript 中完成.

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.

我在使用制表符或保留格式时遇到问题.

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

推荐答案

试试这个:

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

这基本上是寻找两个换行符，中间只有空格.然后它用一个换行符替换那些.由于全局标志 g，这对于每个可能的匹配都会重复.

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.

是否可以用双换行代替单换行

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

当然，最简单的方法是寻找三个换行符并将它们替换为两个:

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

text.replace(/
s*
s*
/g, '

');

如果您想在其中一行中保留空格(无论出于何种原因)，您也可以这样做:

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

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

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