PHP preg_replace匹配兩個換行符

Question

這似乎是一個非常簡單的練習，但它只是沒有爲我工作。

我有一個文本文檔，並覺得一個簡單的方法來HTMLify它是使用快速正則表達式來翻譯2個新行爲</p><p>，這是足夠簡單，我所需要的。

所以;我正則表達式：

\n\h*\n+ 
/** This matches the newline, 
    then any number (zero or more) whitespace 
    and then a second new line. **/ 

這作品在regex101.com，我通常試製出我的正則表達式。但在我的PHP它不工作;

$text = trim($_POST['text']); 
$text = strip_tags($_POST['text']); 

/*** Find new Paragraphs ***/ 
$text = preg_replace("/\n\h*\n/","</p>\n<p>",$text); 
$text = "<p>".$text."</p>"; 

我輸入：

30th Sep 16 

Day 176 has seen more golf balls struck with growing frustration as I try 
to train the brain, a short swim, and a dawning realisation which has led 
to probably the biggest question that I have ever posed. 

但我對PHP的輸出是：

<p>30th Sep 16 

Day 176 has seen more golf balls struck with growing frustration as I try 
to train the brain, a short swim, and a dawning realisation which has led 
to probably the biggest question that I have ever posed.</p> 

添加$count VAR到preg_replace返回零，比賽沒有被找到。

預期輸出：

<p>30th Sep 16 </p> 
<p>Day 176 has seen more golf balls struck with growing frustration as I try 
to train the brain, a short swim, and a dawning realisation which has led 
to probably the biggest question that I have ever posed.</p> 

我缺少什麼？我敢肯定，這很簡單，但我不明白爲什麼它的作品的網站上卻沒有關於我非常簡單的腳本： -/

我自己也嘗試了PHP_EOL和各種代碼的其他排列替換\n，沒有成功。

Answer 1

可能是因爲你有\r\n換行符。對於任何換行順序，請嘗試使用escape sequence\R。

\R\h*\R+ 

See demo at regex101或PHP Demo at eval.in