删除过多的行返回 [英] Remove excessive line returns

问题描述

我正在寻找类似 trim() 的东西，但要在字符串的范围内.用户有时会在输入后输入 2、3、4 或更多行回车，我需要清理此输入.

I am looking for something like trim() but for within the bounds of a string. Users sometimes put 2, 3, 4, or more line returns after they type, I need to sanitize this input.

样本输入

i like cats


my cat is happy
i love my cat



hope you have a nice day

期望的输出

i like cats

my cat is happy
i love my cat

hope you have a nice day

我没有看到任何内置内容，并且字符串替换需要多次迭代才能完成工作.在我提出一个小的递归字符串替换之前，我想看看你们还有什么其他建议.

I am not seeing anything built in, and a string replace would take many iterations of it to do the work. Before I whip up a small recursive string replace, I wanted to see what other suggestions you all had.

我有一种奇怪的感觉，这个也有一个正则表达式.

I have an odd feeling there is a regex for this one as well.

推荐答案

终于搞定了，需要preg所以你用的是php中的PCRE版本，还需要一个\n\n替换字符串，为了不擦除除一个之外的所有行尾:

Finally managed to get it, needs preg so you are using the PCRE version in php, and also needs a \n\n replacement string, in order to not wipe all line endings but one:

  $body = preg_replace("/\n\n+/", "\n\n", $body);

感谢让我走上正轨.

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